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The number of vertexed events (VtxAngel >0) is roughly a factor of 10 less in Pass8. The issue is that the extraction of tracks from trees does not result in 2 tracks which vertex very often, Tracy has been working on this. Below is the comparison of VtxAngle for Pass7 (v17r31), v19r4p1gr14, and v20r3p4 which shows the difference in this variable between the three passes.
From the cut efficiency plots it also looks like there is a lower efficiency for the nTrack branch in pass8 w.r.t pass7, so I took a look the TkrNumTracks variable and indeed there are less events with more than 1 track in pass8:
