Scanning is not the same as using ABM. You have established ABM is not working for you.
Does scanning using tuner B work for you? Please test it. Using automatic scan has no control and is different based on image defaults, so best to use manual scan.
On OpenATV
Menu > Setup > Service searching > Manual scan
Tuner = select the last cable tuner (B for you, J in my picture)
Type of scan = complete
Network scan = off
Clear before scan = off
On OpenViX,
Menu > Setup > Tuner config > Manual scan
Tuner = select the last cable tuner (B for you, J in my picture)
Type of scan = complete
Network scan = off
Clear before scan = off
View attachment 37798