D DLL crashes if not run on the main thread

[raven09]

On Tuesday, 5 September 2023 at 22:53:35 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
> Whatever is going on, that function you showed would not call 
> into druntime. So I don't think it's related.
>
> As of right now I have no tips as I'm tired, but I suspect its 
> on the .net end.

Sorry for the confusion, that function actually runs fine and it 
was something completely unrelated that caused the crash. 
However, swapping that out for a function that does interact with 
the druntime does cause a crash (it calls a function template 
inside of a class and returns the value)