I've set up the 2022.1 live system on an USB stick and enabled the persistent partition as explained in https://www.kali.org/docs/usb/usb-persistence/.

After restarting with persistence, the partition seems to be mapped correctly:

Code:
└─$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            7.8G     0  7.8G   0% /dev
tmpfs           1.6G  1.4M  1.6G   1% /run
/dev/sda1       3.5G  3.5G     0 100% /run/live/persistence/sda1
/dev/loop0      3.0G  3.0G     0 100% /run/live/rootfs/filesystem.squashfs
tmpfs           7.8G   99M  7.7G   2% /run/live/overlay
overlay         7.8G   99M  7.7G   2% /
/dev/sda3        54G  292K   51G   1% /run/live/persistence/sda3
tmpfs           7.8G     0  7.8G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           7.8G   28K  7.8G   1% /tmp
tmpfs           1.6G   80K  1.6G   1% /run/user/1000
Nevertheless all new data/files are still written to the overlay partition and lost after the next reboot.

How can I get rid of the overlay partition?