Hi TB, in your perambulation of Level 1, please try putting down stash bags at various locations. For in Cordon, on Sid's floor in Level 1, a couple of stashbags were used and vanished. If you have a save please, for I understand you are testing areas to sort them as you go. In the Swamp are fixed stashbags which don't disappear from the players rucksack when use is employed, it is thus surprising that a solid concrete floor absorbs rucksacks.
BestWishes, TrueB.