Issue #22960: CaveILHallEntrance01.nif - mesh gap
There's a gap in part of this mesh. A good example is 000EB439 in Bonechill Passage.
This was reported in Issue #22882 as a placed reference bug, but it's the mesh that's at fault.
I recall that Dwip was able to see the gap in Blender (or whatever program he was using).
Oh, and I suppose this is obvious, but it will need a fix for USLEEP and USSEP whenever someone gets around to fixing it.