Cannot Scan groupfolders

Hello everyone :wave:

I have an issue scanning group-folders content. The group-folder app works like a charm, I can display the group-folders using the occ command, and get their size. But I can’t find why the scan feature does not scan properly (it returns zeros).

I am running Nextcloud v27.1.7, behind Nginx v1.22.1 on a Debian Bookworm.
I use Redis for file-locking, and I have HPB up and working.
Maybe important note: I use S3 (using Garage) as my main storage system.

Here are the commands I use:

sudo -u www-data php occ groupfolder:list
+-----------+------------------------------------------+--------------------------------------------------+-----------+----------+----------------------+-----------------------------+
| Folder Id | Name                                     | Groups                                           | Quota     | Size     | Advanced Permissions | Manage advanced permissions |
+-----------+------------------------------------------+--------------------------------------------------+-----------+----------+----------------------+-----------------------------+
| 3         | Administration                           | admin: read, write, share, delete                | Unlimited | 0 B      | Enabled              |                             |
| 5         | Group1                                   | admin: read, write, share, delete                | Unlimited | 240.7 GB | Enabled              | admin (group)               |
| 9         | Group2                                   | Team1: read, write, share, delete                | Unlimited | 423.7 MB | Enabled              | admin (group)               |
sudo -u www-data php occ groupfolders:scan --all
+-----------+---------+-------+--------------+
| Folder Id | Folders | Files | Elapsed time |
+-----------+---------+-------+--------------+
| 3         | 0       | 0     | 00:00:00     |
| 5         | 0       | 0     | 00:00:00     |
| 9         | 0       | 0     | 00:00:00     |

Could you tell me what I am missing ?