I rode the gravel bike today, and the Varia, Tickr, and Rally pedals all worked fine. It appears factory reset fixed this issue. The only (minor) issue for me was needing to reload my favorite Garmin IQ data field (WindFields), easy enough to get it back ... but the data screen migration didn't bring it over with all the other data fields.
I'll test the road bike tomorrow to see that the Quarq and speed sensor are happy too.