In the top right of the UI, the power tab that lists all major civs has a bug.
When the list of major powers grows to the point where you need to scroll through them, the last power in the list is no longer clickable.
So you can't use the list to get to the last powers diplomacy screen, which is annoying.
This has been a problem since forever. Hoping this can get fixed as its adds way to many clicks to the game to circumvent.