Lokal songs greyed out

[Aiona]

So I've recently found out that you can add local data to your Spotify. I use the app on my phone so I added all the songs I had downloaded to my Spotify. I was very happy that by liking them I can add them to my liked songs playlist and also add those local songs to playlists now.

But what I noticed now (with two songs so far) is that sometimes Spotify shows those songs greyed out in my liked playlist or any other playlist I added them to. I can still play the songs by clicking on them like normal even if greyed out, but it does not play them in shuffle or when clicking to play the whole playlist.

I tried to remove them from all playlist and adding them again just like completely deleting my local data and adding all of them again, but it did not fix the problem.

Even stranger is that one of the two songs previously wasn't greyed out and working normally but now is.

Does anyone know what causes this/how to fix it?