When editing the subtasks of T2212, I get the following error message: "Too many relationships (25, of type "task.has-subtask"). Must be less than 20."
This seems like a rather arbitrary limitation. It even prevents removing subtasks from that task (unless I were to remove at least 5 of them, I guess).
Changing the relationship from the other direction works. It's not necessarily fun to do it that way, but it is an option at present.
Huh, thanks for the advice, I didn't expect that to work. The limit shouldn't exist, but if it does, then it probably shouldn't be bypassable that way…
aklapper opened https://gitlab.wikimedia.org/repos/phabricator/phabricator/-/merge_requests/73
Restrict number of edges to edit in one transaction for less trusted users