New Plex-server doesn't find all TV Shows

ok apparently there must be something wrong with the new plex-server package. i have now tested a bit and maybe a there might be a hint for the developers.

the two series: 12 monkies / dead mice don’t lie, are not found by plex at all.

what i have done so far:

Result - still not recognized, even after force refresh / rescan the library / reboot the server.

I then created a new library with only this path: “/mnt/blackSTORAGE/2_serien/TV Shows” in it

However, the scanner had scanned them briefly, but indexed nothing in the existing library. I also did emty trash / DB optimization - brings no improvement.

kind regards
deepwather