diff --git a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/GeneratedSources/ExportedProperties_ScriptProperties.generated.cs b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/GeneratedSources/ExportedProperties_ScriptProperties.generated.cs
index 94d447f61a6..636cd82a118 100644
--- a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/GeneratedSources/ExportedProperties_ScriptProperties.generated.cs
+++ b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/GeneratedSources/ExportedProperties_ScriptProperties.generated.cs
@@ -37,6 +37,18 @@ partial class ExportedProperties
         /// </summary>
         public new static readonly global::Godot.StringName @LamdaPropertyString = "LamdaPropertyString";
         /// <summary>
+        /// Cached name for the 'PrimaryCtorParameter' property.
+        /// </summary>
+        public new static readonly global::Godot.StringName @PrimaryCtorParameter = "PrimaryCtorParameter";
+        /// <summary>
+        /// Cached name for the 'ConstantMath' property.
+        /// </summary>
+        public new static readonly global::Godot.StringName @ConstantMath = "ConstantMath";
+        /// <summary>
+        /// Cached name for the 'StaticStringAddition' property.
+        /// </summary>
+        public new static readonly global::Godot.StringName @StaticStringAddition = "StaticStringAddition";
+        /// <summary>
         /// Cached name for the 'PropertyBoolean' property.
         /// </summary>
         public new static readonly global::Godot.StringName @PropertyBoolean = "PropertyBoolean";
@@ -317,6 +329,18 @@ partial class ExportedProperties
             this.@LamdaPropertyString = global::Godot.NativeInterop.VariantUtils.ConvertTo<string>(value);
             return true;
         }
+        if (name == PropertyName.@PrimaryCtorParameter) {
+            this.@PrimaryCtorParameter = global::Godot.NativeInterop.VariantUtils.ConvertTo<string>(value);
+            return true;
+        }
+        if (name == PropertyName.@ConstantMath) {
+            this.@ConstantMath = global::Godot.NativeInterop.VariantUtils.ConvertTo<float>(value);
+            return true;
+        }
+        if (name == PropertyName.@StaticStringAddition) {
+            this.@StaticStringAddition = global::Godot.NativeInterop.VariantUtils.ConvertTo<string>(value);
+            return true;
+        }
         if (name == PropertyName.@PropertyBoolean) {
             this.@PropertyBoolean = global::Godot.NativeInterop.VariantUtils.ConvertTo<bool>(value);
             return true;
@@ -599,6 +623,18 @@ partial class ExportedProperties
             value = global::Godot.NativeInterop.VariantUtils.CreateFrom<string>(this.@LamdaPropertyString);
             return true;
         }
+        if (name == PropertyName.@PrimaryCtorParameter) {
+            value = global::Godot.NativeInterop.VariantUtils.CreateFrom<string>(this.@PrimaryCtorParameter);
+            return true;
+        }
+        if (name == PropertyName.@ConstantMath) {
+            value = global::Godot.NativeInterop.VariantUtils.CreateFrom<float>(this.@ConstantMath);
+            return true;
+        }
+        if (name == PropertyName.@StaticStringAddition) {
+            value = global::Godot.NativeInterop.VariantUtils.CreateFrom<string>(this.@StaticStringAddition);
+            return true;
+        }
         if (name == PropertyName.@PropertyBoolean) {
             value = global::Godot.NativeInterop.VariantUtils.CreateFrom<bool>(this.@PropertyBoolean);
             return true;
@@ -870,6 +906,9 @@ partial class ExportedProperties
         properties.Add(new(type: (global::Godot.Variant.Type)4, name: PropertyName.@FullPropertyString_Complex, hint: (global::Godot.PropertyHint)0, hintString: "", usage: (global::Godot.PropertyUsageFlags)4102, exported: true));
         properties.Add(new(type: (global::Godot.Variant.Type)4, name: PropertyName.@_lamdaPropertyString, hint: (global::Godot.PropertyHint)0, hintString: "", usage: (global::Godot.PropertyUsageFlags)4096, exported: false));
         properties.Add(new(type: (global::Godot.Variant.Type)4, name: PropertyName.@LamdaPropertyString, hint: (global::Godot.PropertyHint)0, hintString: "", usage: (global::Godot.PropertyUsageFlags)4102, exported: true));
+        properties.Add(new(type: (global::Godot.Variant.Type)4, name: PropertyName.@PrimaryCtorParameter, hint: (global::Godot.PropertyHint)0, hintString: "", usage: (global::Godot.PropertyUsageFlags)4102, exported: true));
+        properties.Add(new(type: (global::Godot.Variant.Type)3, name: PropertyName.@ConstantMath, hint: (global::Godot.PropertyHint)0, hintString: "", usage: (global::Godot.PropertyUsageFlags)4102, exported: true));
+        properties.Add(new(type: (global::Godot.Variant.Type)4, name: PropertyName.@StaticStringAddition, hint: (global::Godot.PropertyHint)0, hintString: "", usage: (global::Godot.PropertyUsageFlags)4102, exported: true));
         properties.Add(new(type: (global::Godot.Variant.Type)1, name: PropertyName.@PropertyBoolean, hint: (global::Godot.PropertyHint)0, hintString: "", usage: (global::Godot.PropertyUsageFlags)4102, exported: true));
         properties.Add(new(type: (global::Godot.Variant.Type)2, name: PropertyName.@PropertyChar, hint: (global::Godot.PropertyHint)0, hintString: "", usage: (global::Godot.PropertyUsageFlags)4102, exported: true));
         properties.Add(new(type: (global::Godot.Variant.Type)2, name: PropertyName.@PropertySByte, hint: (global::Godot.PropertyHint)0, hintString: "", usage: (global::Godot.PropertyUsageFlags)4102, exported: true));
diff --git a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/GeneratedSources/ExportedProperties_ScriptPropertyDefVal.generated.cs b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/GeneratedSources/ExportedProperties_ScriptPropertyDefVal.generated.cs
index 0bf0b0845a4..57829cc226b 100644
--- a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/GeneratedSources/ExportedProperties_ScriptPropertyDefVal.generated.cs
+++ b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/GeneratedSources/ExportedProperties_ScriptPropertyDefVal.generated.cs
@@ -11,7 +11,7 @@ partial class ExportedProperties
     [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
     internal new static global::System.Collections.Generic.Dictionary<global::Godot.StringName, global::Godot.Variant> GetGodotPropertyDefaultValues()
     {
-        var values = new global::System.Collections.Generic.Dictionary<global::Godot.StringName, global::Godot.Variant>(64);
+        var values = new global::System.Collections.Generic.Dictionary<global::Godot.StringName, global::Godot.Variant>(67);
         string __NotGenerateComplexLamdaProperty_default_value = default;
         values.Add(PropertyName.@NotGenerateComplexLamdaProperty, global::Godot.Variant.From<string>(__NotGenerateComplexLamdaProperty_default_value));
         string __NotGenerateLamdaNoFieldProperty_default_value = default;
@@ -26,6 +26,12 @@ partial class ExportedProperties
         values.Add(PropertyName.@FullPropertyString_Complex, global::Godot.Variant.From<string>(__FullPropertyString_Complex_default_value));
         string __LamdaPropertyString_default_value = "LamdaPropertyString";
         values.Add(PropertyName.@LamdaPropertyString, global::Godot.Variant.From<string>(__LamdaPropertyString_default_value));
+        string __PrimaryCtorParameter_default_value = default;
+        values.Add(PropertyName.@PrimaryCtorParameter, global::Godot.Variant.From<string>(__PrimaryCtorParameter_default_value));
+        float __ConstantMath_default_value = 2  * global::Godot.Mathf.Pi;
+        values.Add(PropertyName.@ConstantMath, global::Godot.Variant.From<float>(__ConstantMath_default_value));
+        string __StaticStringAddition_default_value = string.Empty   + string.Empty;
+        values.Add(PropertyName.@StaticStringAddition, global::Godot.Variant.From<string>(__StaticStringAddition_default_value));
         bool __PropertyBoolean_default_value = true;
         values.Add(PropertyName.@PropertyBoolean, global::Godot.Variant.From<bool>(__PropertyBoolean_default_value));
         char __PropertyChar_default_value = 'f';
diff --git a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/Sources/ExportedProperties.cs b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/Sources/ExportedProperties.cs
index d7fcdc6b1b5..2f55bcf6125 100644
--- a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/Sources/ExportedProperties.cs
+++ b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/Sources/ExportedProperties.cs
@@ -1,7 +1,7 @@
 using Godot;
 using System;
 
-public partial class ExportedProperties : GodotObject
+public partial class ExportedProperties(string primaryCtorParameter) : GodotObject
 {
     // Do not generate default value
     private String _notGeneratePropertyString = new string("not generate");
@@ -91,6 +91,18 @@ public partial class ExportedProperties : GodotObject
         set => _lamdaPropertyString = value;
     }
 
+    // Primary Constructor Parameter
+    [Export]
+    public String PrimaryCtorParameter { get; set; } = primaryCtorParameter;
+
+    // Constant Math Expression
+    [Export]
+    public Single ConstantMath { get; set; } = 2 * Mathf.Pi;
+
+    // Static Strings Addition
+    [Export]
+    public string StaticStringAddition { get; set; } = string.Empty + string.Empty;
+
     // Auto Property
     [Export] private Boolean PropertyBoolean { get; set; } = true;
     [Export] private Char PropertyChar { get; set; } = 'f';
diff --git a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ScriptPropertyDefValGenerator.cs b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ScriptPropertyDefValGenerator.cs
index e2422ae1ed5..5400115fa44 100644
--- a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ScriptPropertyDefValGenerator.cs
+++ b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ScriptPropertyDefValGenerator.cs
@@ -336,7 +336,11 @@ namespace Godot.SourceGenerators
                 if (initializer != null)
                 {
                     var sm = context.Compilation.GetSemanticModel(initializer.SyntaxTree);
-                    value = initializer.Value.FullQualifiedSyntax(sm);
+                    var initializerValue = initializer.Value;
+                    if (!IsStaticallyResolvable(initializerValue, sm))
+                        value = "default";
+                    else
+                        value = initializer.Value.FullQualifiedSyntax(sm);
                 }
 
                 exportedMembers.Add(new ExportedPropertyMetadata(
@@ -424,109 +428,28 @@ namespace Godot.SourceGenerators
 
         private static bool IsStaticallyResolvable(ExpressionSyntax expression, SemanticModel semanticModel)
         {
-            // Handle literals (e.g., `10`, `"string"`, `true`, etc.)
-            if (expression is LiteralExpressionSyntax)
+            // Find non-static node in expression
+            foreach (SyntaxNode descendant in expression.DescendantNodesAndSelf())
             {
-                return true;
-            }
-
-            // Handle negative literals (e.g., `-10`)
-            if (expression is PrefixUnaryExpressionSyntax { Operand: LiteralExpressionSyntax } &&
-                expression.Kind() == SyntaxKind.UnaryMinusExpression)
-            {
-                return true;
-            }
-
-            // Handle identifiers (e.g., variable names)
-            if (expression is IdentifierNameSyntax identifier)
-            {
-                var symbolInfo = semanticModel.GetSymbolInfo(identifier).Symbol;
-
-                // Ensure it's a static member
-                return symbolInfo is { IsStatic: true };
-            }
-
-            // Handle member access (e.g., `MyClass.StaticValue`)
-            if (expression is MemberAccessExpressionSyntax memberAccess)
-            {
-                var symbolInfo = semanticModel.GetSymbolInfo(memberAccess).Symbol;
-
-                // Ensure it's referring to a static member
-                return symbolInfo is { IsStatic: true };
-            }
-
-            // Handle object creation expressions (e.g., `new Vector2(1.0f, 2.0f)`)
-            if (expression is ObjectCreationExpressionSyntax objectCreation)
-            {
-                // Recursively ensure all its arguments are self-contained
-                if (objectCreation.ArgumentList == null)
+                // Constant nodes are static
+                if (semanticModel.GetConstantValue(descendant).HasValue)
                 {
-                    return true;
+                    continue;
                 }
-                foreach (var argument in objectCreation.ArgumentList.Arguments)
+
+                // Check non-static symbol
+                SymbolInfo symbolInfo = semanticModel.GetSymbolInfo(descendant);
+                if (symbolInfo.Symbol is ISymbol symbol)
                 {
-                    if (!IsStaticallyResolvable(argument.Expression, semanticModel))
+                    if (symbol.Kind is SymbolKind.Local or SymbolKind.Parameter)
                     {
                         return false;
                     }
                 }
-
-                return true;
             }
 
-            if (expression is ImplicitObjectCreationExpressionSyntax)
-            {
-                return true;
-            }
-
-            if (expression is InvocationExpressionSyntax invocationExpression)
-            {
-                // Resolve the method being invoked
-                var symbolInfo = semanticModel.GetSymbolInfo(invocationExpression).Symbol;
-
-                if (symbolInfo is IMethodSymbol methodSymbol)
-                {
-                    // Ensure the method is static
-                    if (methodSymbol.IsStatic)
-                    {
-                        return true;
-                    }
-                }
-            }
-
-            if (expression is InterpolatedStringExpressionSyntax interpolatedString)
-            {
-                foreach (var content in interpolatedString.Contents)
-                {
-                    if (content is not InterpolationSyntax interpolation)
-                    {
-                        continue;
-                    }
-                    // Analyze the expression inside `${...}`
-                    var interpolatedExpression = interpolation.Expression;
-
-                    if (!IsStaticallyResolvable(interpolatedExpression, semanticModel))
-                    {
-                        return false;
-                    }
-                }
-                return true;
-            }
-
-            if (expression is InitializerExpressionSyntax initializerExpressionSyntax)
-            {
-                foreach (var content in initializerExpressionSyntax.Expressions)
-                {
-                    if (!IsStaticallyResolvable(content, semanticModel))
-                    {
-                        return false;
-                    }
-                }
-                return true;
-            }
-
-            // Handle other expressions conservatively (e.g., method calls, instance references, etc.)
-            return false;
+            // No non-static nodes found
+            return true;
         }
 
         private static bool MemberHasNodeType(ITypeSymbol memberType, MarshalType marshalType)