DVD w/ a filesystem - no udev event

[poidi]

Hi, i don't know where to find a solution or even get more details on the problem - maybe someone can guide me in the right direction.

When using CentOs 6.9 our headless appliance was able to recognice via udev rules whenever a disc was inserted in the optical drive - there was a change_event on the divice sr0.

Now when using AlmaLinux 8.8 these events are only produced, when a disc containing a valid filesystem is inserted in the drive.
Meaning, whenever an "empty", a heavily scratched or an up-side-down disc is entered into the drive, the system is none the wiser.

Strangely when using a vanilla AlmaLinux 8.8 with a KDE there is also no udev-event, BUT after some time the disc gets ejected anyways. I have not found out what triggers that behaviour.

This was the only resource that touched this topic, but it is no real help, cause it more or less states, that it is not possible to be done:
https://superuser.com/questions/862533/how-to-start-a-systemd-service-when-a-dvd-is-inserted

Any help is very much appreciated!

Thanks
poidi