Bug
CQ + Slot selector buggy on the satellite!
This causes a bunch of issues:
The slot number is appended to the callsign instead of appearing in the slot column.
Failure to connect upon answering the CQ.
The RELAY indicator may NOT clear after retrieving vmails.
Spotted in v12.0.4
Workaround and Suggested Fix
Enabling Skip Slot Selector makes things work, though of course you lose the slot selection functionality. At the moment, most stations don't have auto-qsy ability on the satellite yet (though a few e.g. Pluto SDRs do). So probably best by default to disable CQ slot selection and requirement to QSY when on QO-100 satellite. And if it is on, warn that it may cause issues with stations that lack the capability.
Example
Effect of Skip Slot Selector
I dont see the issue. use the slot system just disable the frequency control of VarAC and perform manual QSY. If frequeny CAT control is disabled, VarAC will prompt you where to QSY manually with a popup when needed.