External storage not working as expected

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Nextcloud version: 22.2.3
Operating system and version: Debian 10
Apache version : Apache 2.4.38
PHP version: 7.4.27

The issue you are facing:

Only 1 external storage works, others with the exact same configuration fail.
I have 5 NFS mounts, hosted on the same NAS, with the exact same permissions, exact same base path, no contents in them whatsoever, but only 1 of these mounts work as external storage. The others do not allow me to upload any files. When I try do to so, I just get a small “forbidden” message popup.

Permissions on all of the 5 moutns:
drwxr-x--- 7 www-data www-data

Is this the first time you’ve seen this error?: No, I’ve attempted this before, but then none worked

Steps to replicate it:

  1. Mount NFS mount
  2. Add external storage as type local
  3. Try to upload files

The output of your Nextcloud log in Admin > Logging:

Nothing, no nextcloud logs get created

The output of your Apache/nginx/system log in /var/log/____:

Unable to find anything significant in the apache2 error or access logs

As all 5 mounts are exactly the same, except for their name, what could be causing this?