I hope I am in the right place here.

Since the update from SLES 15/SP3 to SP4, ownership rights of containers to the /dev/null device are passed to the node.
On newly deployed SP4 systems we could also generate this behavior.
For example, the container user with ID=100 passes its permissions to /dev/null of the host. Then the permissions are given back to root or taken away and on and on.
This problem probably occurred with changes in RunC package 1.0.3- to 1.1.3. There was no improvement with version 1.1.4.
The servers have the latest patches installed.
Changing node ownership on /dev/null does not affect the container /dev/null device. Also, the other way around, ownership is not transferred from inside the container to the node.
There are no bidirectional effects.

Any ideas?