Lane discrepancy between Nu 10.2 and 10.3

has anyone noticed this bug/feature where comps made in 10.2.20 play back differently in 10.3?
specifically, if a muted clip is on top in 10.2, it won’t be in 10.3. one notices this when a track of mostly muted parts (10.2) is suddenly playing unmuted takes in 10.3

not a big deal if you know about it and remember to open projects in the version they were created in. but still kind of odd.