In two instances, once on 1.10 Experimental and once 1.10 Stable I have had a cooking pot and canister assembled with a gas stove and all but the gas stove is gone after logging out and logging back in.

Both instances I have had the cooking pot filled with water with various food items in them. First instance tomatoes, second instance boiled wolf steaks.

Either way, I found a new large canister and attached it to the gas stove so that I had just only the gas stove and large canister assembled and after logging out/logging in only the gas stove remained.

I have since had a large canister and gas stove separate in the inventory (not assembled) and logged off/logged on and they remained.