HIFICAST minidlna vs gerbera album level artwork

[pluffmud]

I currently use minidlna on my PI4B as my dlna music server and it works well with HIFI Cast .

I installed gerbera 2.1.0 to be used in case minidlna is no longer an option .

My puzzle is  this .

When using minidlna the album artwork is shown at the album level and the song level .

When using gerbera the album art work is sometimes shown at the album level but allways looks correct at the song level.

I used metaflac to look at the metadata for a song from each of the albums and can see no difference other than the song specific stuff .

Is there some specific attribute HIFI cast is using to choose when the artwork is displayed at the 'album level' ?

All the artwork is embedded in the flac files .

[pluffmud]

I'm thinking its the size of the artwork in the flac files . The block size in the 'good' files is 58,127 and 86,135 in the 'bad' files . It may be a gerbera db issue .