Had to load a save of this map after accidentally deleting something (and undoing didn’t work) and more of my pickups experienced this bug, including several that were just flat and on the ground. So I was probably wrong about the conditions for this bug happening.
Probably the last reply I’ll make unless I find something crazy different but I’m hoping showing multiple examples of this happening at least helps show some sort of pattern or underlying cause for the issue that I’m not seeing.
I just placed some weapon pickups in a map before trying out the playtest feature added in the new patch. During the playtest some of the weapons were in their right spots while others were slightly in the ground, but after exiting the playtest, every weapon pickup in the map was moved to the origin point.