This is a pretty old post but the topic is of interest to me too and I have a partial answer.
I'm the Villainess So I'm Taming the Final Boss has the reversible cover with the German rating and text on the inside, so doesn't have the interior art. It also has English/French/German on the back of the slipcover.
I know you got an answer on Saving 80,000 Gold in Another World for My Retirement, but I didn't feel the info was quite complete. As that post showed, it has the interior art. But it doesn't have any German language on the discs, so it wouldn't be distributed in Germany anyway. It's only French and English for both subtitles and dub.
Another that you didn't mention so I don't know if is in question but I will describe as a contrast to that one: Why Raeliana Ended Up at the Duke's Mansion has interior art, so no German reversible cover, and only English and French on the back of the case and slipcover. But it has English, French, and German dubs and subtitles, and the disc labels have the FSK ratings logos on them, so the discs are identical to a German release, but if there is one it would have its own packaging I assume.
Have they completely stopped doing this? Or maybe all of the below just weren't released in France and Germany? (I don't know how to determine what they release in those countries.) I have the following newer releases, and all are English/Japanese only, with only English text on the covers, and only BBFC ratings logos, and in the standard 14mm thick cases instead of the 12mm that the joint releases came in:
- Dr. Stone New World Season 3 Part 1
- Dr. Stone New World Season 3 Part 2
- Frieren: Beyond Journey's End Part 1
- Sound! Euphonium Season 1
- Villainess Lv. 99 I May Be the Hidden Boss but I'm Not the Demon Lord
I prefer the packaging in the thicker cases anyway so it's fine for me.
