Not possible to disable User Share cache mode if no cache pool is present

This user had the problem that one of his containers (probably) created the path /mnt/cache although he had no cache pool and by that it was not possible to disable the caching:

And as default cache setting of the appdata share is "Prefer" all Containers installed their files into this path, which flooded his RAM:

root@Tower:~# du -sh /mnt/cache
2.3G    /mnt/cache

ls -la /mnt/cache/appdata
total 0
drwxrwxrwx 8 nobody users 160 Apr  8 20:52 ./
drwxr-xr-x 4 root   root   80 Apr  9 04:40 ../
drw-rw-rw- 7 root   root  220 Apr  8 19:43 MQTT/
drwxrwxr-x 4 nobody users 120 Apr  8 20:07 binhex-krusader/
drwxr-xr-x 4 nobody users 100 Apr  8 20:52 mariadb/
drwxr-xr-x 8 nobody users 180 Apr  8 21:18 nextcloud/
drwxrwxrwx 7 root   root  140 Apr  8 18:41 onlyofficeds/
drwxr-xr-x 4 root   root   80 Apr  8 18:38 pihole/

Proposal:

It should be possible to disable the caching even if no cache pool is present. Or nothing should be able to create the /mnt/cache path as long no cache pool is present.