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HelloCallback throws System.OutOfMemoryException when passing C# callback into native library

Callback passing into native library currently does not work (currently blocking my ability to consume emscripten_fetch), minimal reproduction scenario is can be found in HelloCallback 7987aa98b8

Delegate and extern declarations:

    unsafe internal delegate void HelloCallback(int result);

    [DllImport("hello_callback")] unsafe extern internal static void helloCallback(int number, string str, HelloCallback callback);

Inline static method declaration and call into native code supplying the function (the inline as opposed to separate method declaration did not change the result):

            static void testCallback(int result)
            {
                Console.WriteLine($"from C#: Received {result} from C library callback");
            }

            // This completely blows up with the following, the native printf() is never hit:
            // System.OutOfMemoryException: Insufficient memory to continue the execution of the program.
            helloCallback(123, "abc", testCallback);

Relevant stacktrace:

System.OutOfMemoryException: Insufficient memory to continue the execution of the program.
   at S.P.CoreLib.Internal.Runtime.Augments.RuntimeAugments.CreateThunksHeap (http://localhost:8000/HelloCallback.wasm:wasm-function[4636]:0x2a4c30 undefined)
   at S.P.CoreLib.System.Runtime.InteropServices.PInvokeMarshal.AllocateThunk (http://localhost:8000/HelloCallback.wasm:wasm-function[4634]:0x2a47a0 undefined)
   at S.P.CoreLib.System.Runtime.CompilerServices.ConditionalWeakTable.2.CreateValueCallback<System..Canon.System..Canon>.InvokeOpenStaticThunk (http://localhost:8000/HelloCallback.wasm:wasm-function[4635]:0x2a4b06 undefined)

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