Followup from T221112:
The `move_project` script does not check if
In T195855#5190491, the command created data inconsistency.
For example, `T57111` was in both `#Pywikibot-other-scripts` and `#pywikibot-solve-disambiguation.py` or `T57020` was in both `#Pywikibot-other-scripts` and `#pywikibot-weblinkchecker.py`. The script does not check if a task is in both the future parent and the future subproject, to remove the future parent project when turning a project into a subproject.
Affected tasks were: https://phabricator.wikimedia.org/maniphest/?ids=104952,105581,57111,57020,167709,85334,117176,57048
A task can only be in *one* subproject of the same parent project, so tasks like https://phabricator.wikimedia.org/T85334 have invalid associated project data now.
I think there's currently nothing else left for me here? :)