Playlist is partially lost

I added a whole folder of my NAS to the playlist with “add, replace and play”. The folder has some subfolders.
The music is currently playing ok, but if I go to the Playlist tab I have to wait and after a significant delay I see only the songs left, not the previously played ones. Also I cannot play the previous song anymore, since songs disappear after play.

Given the delay, I expect this bug to be related to the delay I experience when I try to browse my NAS.

My bad, the “consume” setting was enabled.