Just got back from some beta 3 testing on the Odroid N2.
I noticed a weird thing regarding colouring. When playing games with deep black backgrounds (most noticeable on older platforms such as NES, SNES, MD and MS) the color is somewhat oss. Turning black into something greyish. If i disable on screen border decorations, this problem disappears on it's own.
Also, when it comes to CD-based games, it seems like certain audio tracks and sound effects are struggling. At first i noticed that background music on Dreamcast felt flat, like certain songs are missing "instruments". Then i noticed that certain sound effects were missing. This was most evident with games like Crazy Taxi and Skies of Arcadia.
At first i thought that this issue was only present on Dreamcast, but then i noticed the same issue when playing Sega CD games. The so recognicable "ring sound" from Sonic CD cuts off when playing in the game.
I don't remember having this particular issue on 5.22 beta 1 or 2. It's really strange.