You can't interact with gas cannisters while riding a janicart
Created by: MusgardTiger
Title explains it all, you can't. You can connect a tank to the cannister, you can open the menu but buttons don't respond. I had to get down from the janicart and continue my business on foot. I tried it few more times on and off janicart. You can't use cannisters while you are on a janicart. This happened on Box, just in case map type matters.