Problems with double albums showing as separates

I have problems with some multiple disk albums presented as separate disks with the same title. They are properly tagged, sitting in the same directory on hard disk and the track names are DISK#-TRACK#-TRACK_NAME. The ID3 tags are present, each track has defined DISKTOTAL and DISKNO values. How should the library be organized and ID3 tags set, so that the ROON does not have problem qualifying double albums as one album consisting of two disks ?
Can anybody help ?

Not sure how to suggest you change the tagging, what you have done sounds right. But in case you did not know you can fix this in Roon by selecting both albums and then select edit function and there is an option to merge them together.

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Exactly, don’t change tags just use the merge option.