I have a couple of playlists that I have downloaded all the songs, about 1700 songs in total. I am often out of coverage, so need these downloads.

Today when I went into the downloaded playlist, the songs were in the playlist however instead of having the normal green downward facing arrow on the left indicating the song was downloaded, all the songs in the playlist were grey and were not recognized as downloaded.

I checked the storage on my phone and it indicated that the data storage for Spotify was around 4.5 gb, what I would expect for 1700 songs.  So the downloaded songs were definitely on my phone, it is just that for some reason the app didn't recognize them.

I uninstalled and reinstalled spotify, so now they have been deleted from storage so I will download them all again.  However this isn't the first time that I've had an issue where my songs are still on the phone but the app doesn't seem to recognize them.  They were definitely there yesterday and for a while.

Running Android 7, Spotify version 8.3.0.687armv7