I've seen another post with someone with the same issue regarding colour pallet. It was also the same when I set my s23 ultra up. Didn't come up with the option of colours to choose from to match the wallpaper. Clicked on colour pallet myself after and then chose. I would report an error to the developers within the members app. At the bottom go to support to send the error report, let the developers aware of the two issues within the 5.1 update.
Thanks Fiona . Yeah , seems like this needs to be reported to the developers as I just had a chat with the support and they seem to have no clue. All they ask me to do is to clear the cache or to do an app reset .