Song Track Icons Issues

The little album icon next to some tracks indicating there are several other recorded versions of that same song is not consistently applied.

As you can see from this album by The Wood Brothers, the song Angel has 31 other versions, and the song Buckets of Rain has 50 other versions. But what about Make Me Down a Pallet on Your Floor? It is a standard from the turn of the century with at least 12 other versions and probably a lot more. It has no reference to other versions here.