I've noticed an issue with placing tents or barrels inside of some structures, specifically the brown barns located North and South of Nagornoe.
I can drop a barrel from my hands and it appears to sit lower than the floor. Maybe it's an elevation issue? No other objects were obstructing the placement of the tents or barrels. I was trying to use a Car tent and a large tent. I tried this on other flat surfaces with lots of trouble.