Barrels and seachests (atleast) are inaccessible in certain situations since the update they dont show up in the vicinity tab some cant be opened, I had a large tent with camo net set up with a seachest outside against it i removed the tent and was able to access again i put tent down and camo on and couldnt, removing the camo net allowed access in this instance but with a car tent of barrels along the walls the majority are not usable
(i havent attempted to remove the contents of the car tent and see if picking it up makes them accessible again but if/when i do i will report an update here