@Aklapper No worries, there's absolutely no urgency to this, just a mild inconvenience. :-) But still wanted, yes.
I believe the reason you weren't subscribed is that IIRC your huge Herald rule excludes stuff from WMNO (and other chapters) since tasks in those projects normally aren't anything you need to check on, so I guess that rule took precedence over the task also being in a different project.
- Checked that no tasks have both tags
- sudo /srv/phab/phabricator/bin/move_project --subproject --child "WMNO-General" --parent "WMNO" --keep-members child
Sorry again that this took ages. :-/