PtrToStructure with array fields on iOS (ie AOT only mode)

Has anyone had any luck with getting PtrToStructure working with 'array' fields in a struct? I keep getting "Attempting to JIT compile method" error when attempting it.

For example:

 [StructLayoutAttribute(LayoutKind.Sequential)]
 public struct TestByteArrayStruct {
     public UIntPtr Length;
 
     [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst=1024)]
     public byte[] Data;
 }

And then at runtime you attempt to do something like:

 TestByteArrayStruct test = (TestByteArrayStruct) Marshal.PtrToStructure(ptr, typeof(TestByteArrayStruct))

Works fine in the editor, but at runtime on iOS you will get:

 ExecutionEngineException: Attempting to JIT compile method '(wrapper unknown) TestByteArrayStruct:PtrToStructure (intptr,object)' while running with --aot-only.

Which from my understanding/googling means the AOT compiler hasn't generated the appropriate method signature for that type.

The problem SEEMS to be with the UnmanagedType.ByValArray...

If I change it to be something like this...

 [StructLayoutAttribute(LayoutKind.Sequential)]
 public struct TestByteArrayStruct {
     public UIntPtr Length;
 
     [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst=1024)]
     public string Data;
 }

It will work fine.

I have a pretty big data structure that I want to use with various arrays of structs, but if UnmanagedType.ByValArray wont work I don't know what to do :(