virtualbox guest: shared folders empty

runnig Manjaro XFCE 20 (Kernel 5.6.19-2-MANJARO (linux56)) as Virtual Box Guest
Virtual Box is 6.1.10
HOST is Window 10

VB guest additions are installed and apparently runnig
user was added to vboxsf group

shared folders are added and appear in /media

(base) [muepf@stefan-virtualbox ~]$ cd /media
(base) [muepf@stefan-virtualbox media]$ ls -l
insgesamt 8
drwxr-xr-x 2 root root 4096 22. Jul 13:47 sf_Q_DRIVE
drwxr-xr-x 2 root root 4096 18. Jul 19:13 sf_VM_Austausch

however, the folders themthelves are EMPTY:

(base) [muepf@stefan-virtualbox media]$ cd sf_VM_Austausch/
(base) [muepf@stefan-virtualbox sf_VM_Austausch]$ ls -l
insgesamt 0
(base) [muepf@stefan-virtualbox sf_VM_Austausch]$

This is very strange, it did work in the past but at some point stopped working.
Access from other guests (WIN10, Ubuntu) to the same shared folders seems to work.

What's wrong there?

We cannot help you with your host system setup.

Using Manjaro as a client is covered in this technical guide to VirtualBox

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