We tried to change the rank of an issue in backlog.
First, we had the issue that the board filter was not sorted by rank. So we fixed that (the filter is simply "project = xyz order by rank asc").
When we try to do it now, we get an error popup, saying
Refresh the page and try again."
Refreshing the page doesn't help. Even force-refresh not.
Incognito mode of Chrome, trying another browser also doesn't help.
Log out, log in again also doesn't help.
Also tried via context menu (... > Move to > Move up), same result.
The permissions "Edit Issues" and "Schedule Issues" are given (checked via permission helper).