Fix IL2CPP build crash on Unity 6000.0.x caused by multiple implement…#203
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sierpinskid merged 1 commit intodevelopfrom Apr 10, 2026
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…ations of the same generic interface IL2CPP's vtable builder in Unity 6000.0.x crashes with a KeyNotFoundException in VTableBuilderComponent.OverrideInterfaceMethods when a type implements multiple closed versions of the same generic interface (e.g. ISavableTo<A> and ISavableTo<B>). The vtable builder uses an unresolved generic parameter name as a dictionary key instead of the resolved concrete type, causing a key mismatch during vtable construction. The bug is fixed in Unity 6000.2.x but affects customers on 6000.0.x. This pattern existed across four internal generic interfaces in the SDK: ISavableTo (9 types), ILoadableFrom (9 types), IUpdateableFrom (4 types), and IStateLoadableFrom (5 types) — 27 types total. Fix: for each interface, introduce numbered variants (e.g. ISavableTo2, ILoadableFrom2/3/4, IUpdateableFrom2/3/4/5, IStateLoadableFrom2) that are structurally identical but distinct in the type system. Each type's secondary and tertiary implementations are moved to the numbered variant, so no type ever implements multiple closed versions of the same generic interface. Matching extension method overloads ensure all existing functionality and DTO conversions are preserved.
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…ations of the same generic interface
IL2CPP's vtable builder in Unity 6000.0.x crashes with a KeyNotFoundException in VTableBuilderComponent.OverrideInterfaceMethods when a type implements multiple closed versions of the same generic interface (e.g. ISavableTo and ISavableTo). The vtable builder uses an unresolved generic parameter name as a dictionary key instead of the resolved concrete type, causing a key mismatch during vtable construction. The bug is fixed in Unity 6000.2.x but affects customers on 6000.0.x.
This pattern existed across four internal generic interfaces in the SDK: ISavableTo (9 types), ILoadableFrom (9 types), IUpdateableFrom (4 types), and IStateLoadableFrom (5 types) — 27 types total.
Fix: for each interface, introduce numbered variants (e.g. ISavableTo2, ILoadableFrom2/3/4, IUpdateableFrom2/3/4/5, IStateLoadableFrom2) that are structurally identical but distinct in the type system. Each type's secondary and tertiary implementations are moved to the numbered variant, so no type ever implements multiple closed versions of the same generic interface. Matching extension method overloads ensure all existing functionality and DTO conversions are preserved.