The player tested again and reported this. I know it prob doesn't help much. But the issue seems to only happen when the rug is placed hanging off of a triangle floor
"oh yeah its only on a the triangle floor, that this is happening on, the foundation ones ive placed are still there. where as the ones on the raised floors disappear. i though ahead about this and placed a few others in different spots and square floors and foundations had no issues, and triangle foundations where also ok, just the hanging triangle floor rug sees to be the issue with removing. It seems to be a 48 hours from when i placed it. being there an hour after reset but then gone."