Handling music boxes

[Fritz]

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The difference is probably that the CDs in the Piano Sonatas set don't contain disc number information. You can edit the Mercury set to remove DISCNUMBER tags if they are present and add GROUP tags for the CD titles. This should make the two sets look similar.
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Both sets use the DISCNUMBER tags. I played with emptying the tags and setting mergeFolderAlbums to true without achieving to display the album icons only.

On the other hand with A-Z in the Naim app switched on the disc links are at the end of the list of album icons so that's ok... . I will play a little bit with the two examples to see what could cause the different presentations.