I didn’t see the thread in the beta channel and made a post almost 3 weeks ago: Bug from recent change to Android TV navigation
It seems to have started from version 8.28. There’s even a bugfix note about navigation in the update. I don’t know what they were trying to fix, because I thought it was fine before.
People in the beta thread said that it wasn’t present in 8.29, but everyone in this thread seems to still see it.