Comment 5 for bug 1326503

It boils down to whether the Gerrit hook script needs to reassign the bug. If the bug is already assigned to the change owner, the account the script is using has sufficient privileges for the tasks it wants to perform (comment in the bug and change its status). However, if the event happens in a situation where the script wants to assign/reassign the bug, it needs membership in the bug supervisor group to accomplish that. If it *lacks* that then its bug update API call is rejected with an insufficient permission response from Launchpad and nothing happens.