It’s not exactly a bug, but rather a design limitation in the way the music library handles albums, which creates confusion during navigation. Ideally, multi-disc albums in FLAC format that contain either embedded or external cue sheets should be grouped and displayed as a single album.
Without cue sheets, these same files are correctly grouped into one album when the DISCNUMBER tag is present and matches the disc number. With cue sheets (embedded or file-based), the grouping breaks and the album appears as two separate entries, even though it logically represents one multi-disc release.
My suggestion is to align the behavior so that albums with cue sheets follow the same grouping logic as regular FLAC files that rely on the DISCNUMBER tag.
See the screenshot below for the intended album presentation.
Ok so yes not possible sorry, too many possible side effects that would require having a tons of stuff in memory and would prevent scanning very large libraries.