yes, save files help me a lot - I can actually debug and see where the crash is 👍
of course in this case an opengl call seem to not like something about the mash data
so all I know is that a decal mesh that got malformed somewhere
I added more sanity checks and it seem to have worked
( it now attempts to fix the mesh on load more aggressively - or throws away the decal altogether if it's beyond saving)
anyway I added the fix to Patches.zip (Build 1892)
also thank you for finding this and of course helping fixing it!
this is one of those - how nobody have noticed this before bugs 😔