The security bots at the bottom level of labs explode, which destroys any items in the blast radius.
Half the time the glass walls that keeps the items blocked off is not there even without using the computer terminal. In turn, the bots will wander close to the center, where there are dissectors that destroy them, causing them to explode and destroy the end loot on those labs.
With experimental z-levels on, it happens even before I reach the bottom floor.