Frankly I don’t care who broke what. It happened in SU5 and Carenado is working on fixing issues from SU5 but has yet to release them.
Anyway, how do you know it’s a “MSFS” issue? Carenado has publicly stated they will release fixes for things that broke after SU5. I haven’t seen where MSFS steted they broke the toggle button for spoilers so where did you learn that?