Occ trashbin:cleanup --all-users does not empty group folders

Nextcloud version (eg, 20.0.5): Nextcloud 20.0.6
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.10
PHP version (eg, 7.4): 7.4.12

The issue you are facing:

the tashbin:cleanup leaves trash under the “/__groupfolders/” untouched (it does not delete these files