C#: Disallow init-only properties

ReadOnly properties are currently not allowed because the generated code
needs to set them, this also apply to `init` properties because they
need to be set after initialization.

1 files changed, 2 insertions, 2 deletions

diff --git a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ExtensionMethods.cs b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ExtensionMethods.cs
index d67e57edc2..8852b7ebad 100644
--- a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ExtensionMethods.cs
+++ b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ExtensionMethods.cs
@@ -295,8 +295,8 @@ namespace Godot.SourceGenerators
             foreach (var property in properties)
             {
                 // TODO: We should still restore read-only properties after reloading assembly. Two possible ways: reflection or turn RestoreGodotObjectData into a constructor overload.
-                // Ignore properties without a getter or without a setter. Godot properties must be both readable and writable.
-                if (property.IsWriteOnly || property.IsReadOnly)
+                // Ignore properties without a getter, without a setter or with an init-only setter. Godot properties must be both readable and writable.
+                if (property.IsWriteOnly || property.IsReadOnly || property.SetMethod!.IsInitOnly)
                     continue;
 
                 var marshalType = MarshalUtils.ConvertManagedTypeToMarshalType(property.Type, typeCache);