I'm experiencing an issue where a handful of placeables are vanishing during resets. Two resets ago it was the floor tiling. This reset it was the floor tiling, some walls (but not all) and a banner. I can't identify a common thread for any of the things that have vanished.
This occured in Warehouse 3 of Port-a-Lucine. Nobody got in to blow things up - and the floor tile was placed separately from the other things anyway.