It started with High Sierra and has carried over to Mojave and Catalina.
Thanks for clarifying. I thought it was earlier.
That’s a long time without a new release to fix a serious issue.
AFAIK, the plan to fix this sync issue is via the Open Source Beat Buddy effort.
Even though that is open source, we need SS to fix this. Nobody outside of SS has been able to build BBM on the Mac. SS seems to be 100% focused on the Windows side right now.