Thank you so much LukasDaum for finding this. I was going to look myself to see if there was anything I could do but I’m not using a source build.
A workaround for now seems to be to just do the work you need to then restart the engine, then without touching anything just press play and it’ll work.
This ofcourse isn’t good at all. I’m hoping 5.3 comes out quickly I don’t have much time left on this project lol