Nextcloud: `occ app:` has wrong return codes

[TheRealBecks]

Nextcloud version 31 has wrong return codes for the occ app: command:

/var/www/nextcloud # php occ app:list
[...]
Disabled:
  - admin_audit: 1.21.0
[...]

/var/www/nextcloud # php occ app:install --verbose admin_audit
Error: Could not download app admin_audit
/var/www/nextcloud # echo $?
1

/var/www/nextcloud # php occ app:enable --verbose admin_audit
admin_audit 1.21.0 enabled
/var/www/nextcloud # echo $?
0

/var/www/nextcloud # php occ app:install --verbose admin_audit
admin_audit already installed
/var/www/nextcloud # echo $?
1

Lets check again and open an issue in the nextcloud/server project.