Not sure if this is related to the game itself or if the server i'm on is bad. I'm playing on this server called dayz.ninja. my game version is 0.61.136960.
Sometimes when I drop a gasoline canister it'll disappear into the floor right away and I cannot retrieve it. My canister is usually more than 75% full with water inside when this happens, although i'm not sure if that matters.
Usually when I'm about to get attacked by a zombie and I have to drop the canister on the road or floor and it'll just disappear.
Other items such as a barrel, and hatchet have disappeared the same way.
It's not fun to lose any items after carrying it around for so long in-game...