Server Version#: 1.15.3.835 (NAS)
Player Version#: 3.93.1 (web client)
I only have two other (small) normal playlists, and then I create a quick smart playlist called ‘Test’, and immediately delete it again:
It actually does delete the correct playlist, but visually it removed one of my other existing playlists. If I navigate away from playlists and back again the playlists are correct.
So I’m pretty sure this is just a visual bug on the (Web) Player I’m using .