As a work-around, if you make sure you don't upgrade your Enpass desktop app to v6, then things will still sync with your phone.
I uninstalled all versions of Enpass on all my desktop computers, deleted all the Enpass folders in the Documents folder, then re-installed Enpass Desktop version 5.6.9. Everything is syncing fine again now. I'll just have to be very careful to ignore the version upgrade offers.