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I'm trying to rip the BD of the German movie "Horst Schlämmer - Isch kandidiere!", but the disc is not recognized by my drive.

It's the third disk of the same movie and the drive always reports that there would be no disc.

The drive is an LG HL-DT-ST (BD-RE WH16NS60) 1.03 with LibreDrive enabled.

I've tested a different drive (LG BH16NS40) but with the same results.

I bought the first disc and couldn't get the drives to read the disc, so I returned the disc. Some time later I ordered the movie again from the same seller but with the same results.
To ensure that it's not the same disc, I ordered the movie a third time and do now have two discs of the movie at home with the same results - the drive reports that no disc is in the drive.

Any help would be appreciated.

Your drives seem to be picky with bad movies. I have a lot of sympathy with them...

Try to clean the discs with warm water and liquid soap even if they are new. Often an invisible film is on those discs which makes it hard to read.

As a last resort try them in a Pioneer drive. You might have a friend who owns one and he could try to rip it for you.

Good luck!