I've recently discovered an issue when using ch up/down and quick guide to change channels. They seemingly "detach" - where ch+/- would not "see" where the quick guide tuned to.
I can reproduce this issue on both my Fire TV 4k and Tivo Stream 4k - i.e. Android and Android TV - both beta and appstore versions.
- tune to a channel (e.g. 5.1)
- change to another channel using ch + (pg up) (e.g. 5.2)
- change to a different channel using the quick guide (e.g. 25.1)
- try ch + again
it would not change to the next station from the station tuned to (e.g. from 25.1 to 25.2), but from the previously switched to station by ch+ (e.g. to 5.3)
hard to describe ...