This has been reported before.
I suspect Roon is looking for a match based on some tricky track timing algorithm , so it looks and finds the same tracks (from the same albums) in a box rather than a single.
A box like the Buffalo Springfield done is simply all 4 single albums in one box , so it’s likely the tracks and timings are the same regardless of source, so there is nothing to differentiate except the box name.
I did initially suspect some prep work in the lookup ready the Box Set improvement that is promised.