Roon (1.3) splits one album's tracks to different albums by format

I have a number of ‘Sampler’ albums. All tracks on a given album are FLAC but vary in format - 16/44, 24/44 (HDCD), 24/88, 24/96. Roon (1.3) is showing the tracks from this single album as separate albums, with the separation being by format. I’ve checked metadata and verified that each track has the identical name in the ‘Album’ field. Is this album split logic a feature or a bug? If it is a feature, can it be disabled? If it can’t be disabled, how can I manually recombine the split albums?