When trying to sync two tracks, on the right beat, the sync function skips a beat when trying to align the beat grids…
Yeah, this might or might not be desirable, depending on the case.
However, as a tip for everyone else: record a cuepoint where desired, make sure your beatgrids are aligned, play and sync the songs. Once they are synced, press the cue point when you want to bring your track in. It will go back exactly where you want it and hopefully, both track will remain in sync unless the beatgrids have become misaligned during that period of time.
The new sync feature will always try to align the downbeats (yellow lines) of the songs.