@jonas The post was about albums being split into multiple instances. I posted here because the same issue was happening to me and I determined that it was related to the grouping tag field not the sort group by function (except that the group by feature made the issue visible). Changing the grouping tag values stopped the problem so I thought there was value in posting.
Splitting an album by the grouping tag field seems more like a hack to me, not anything intentional. It's fine if there's a feature to enable if someone wants it, but the existing behavior didn't seem to be an intentional feature. I don't see why an album should be broken up at all except possibly compilations into their individual artists.