https://bugs.freedesktop.org/show_bug.cgi?id=109229
--- Comment #6 from Fabian supagu@gmail.com --- Hi Tim, sorry about the slow reply.
I've added instructions on how to reproduce the problem here: https://github.com/godotengine/godot/issues/24783#issuecomment-453380560
Download build.zip and it has everything you need in there.
How would I go about bisecting the changes between 18.2 and 18.3 where things went awry?