This is the latest bizarre and frustrating behavior I am trying to troubleshoot. I have a Jazz Waltz pIayalong I am working on. I started with the style picker for a Jazz Waltz, then substituted JazzWaltzTerryClarke3 in for the drums. During the "a" portion of this style, random measures are without drums on playback. It's always the 2nd bar of a 2-bar phrase that is missing. Any suggestions would be appreciated.

I just downloaded build 423, on a 2019 MacBook Pro 16".