missing "songs" - Ken Follett - Die Säulen der Erde (Ungekürzt)- bug?

[Mehdi5]

Hi - I am currently listening to Ken Follett - Die Säulen der Erde (Ungekürzt) - https://open.spotify.com/album/2oM8cIQReXR3qsYpXlflyS?si=nTtkCiE0SLOtHJPORYvyNA.

In the iOS app the summary shows 509 songs but only 500 can be heard.
In the web application (FireFox 81.0) the summary also shows 509 songs - you can also listen to them but only 508 are visible.

[MEM11]

Recently I noticed the entire album “The Theory of Everything” was removed from spotify. All other albums are available. It was also removed from several playlists I had different songs from it on. There’s no explanation for it and nowhere to ask.