I am able to reproduce this by being moved out of range of the chest while still in the gui. Sometimes the chest is stuck completely open and twitches, but most of the time the chest is stuck open and closes for the duration of being used. We tried to see if we could dup items with this, and found the issue does not happen if you move the contents of the chest.
Hello! Same thing just happened on my realm with 3 players on, rolled back 3 past midnight to the most recent backup from 15 minutes prior