The playlist is looking at the old mount point, that is why it isn’t playing
From one of my playlists
{“service”:“mpd”,“uri”:“mnt/NAS/HD_Music/Pink Floyd/(1975) Wish You Were Here/02 - Welcome to The Machine.flac”,“title”:“2 - Welcome to The Machine”,“artist”:“Pink Floyd”,“album”:“Wish You Were Here”,“albumart”:“/albumart?cacheid=851&web=/Wish%20You%20Were%20Here/large&path=%2Fmnt%2FNAS%2FHD_Music%2FPink%20Floyd%2F(1975)%20Wish%20You%20Were%20Here&icon=fa-tags&metadata=false”},
If the path changes, the playlist cannot find the file to play