M51 users report these bugs.

[IcyJay30]

If you facing these bugs then send feedback

A- 2 Same notification when manually updating weather from homescreen widget.

B- Video recordings save in HEVC format. But It always show MP4 in default gallery this issue is since beginning.

C- HDR is not upto mark if face and a light source(tubelight,sun) are in same frame specially from front cam.

D- Game performance have downgraded since OneUI 3 update specially games based on OpenGL.

E- Few deep sleeping apps are sending notification(means somehow they are able to run in background).

also when you add any app in deep sleep same app is also addable to normal sleep. Which Wasn't the case earlier. 

Test things above by yourself then report.

Cleaning cache/data, safemode, wipe cache partition, reset isnot the solution!

[rahul2006]

Many devices have decreased performance after ui 3.1 update

[Itsdebby]

Right

[Alphonsokurukuchu]

I don't see any opengl degradation in dolphin emulator in xenoblade as for now. Vulkan performs superbly but tends to overheat but opengl maintains constant heat at 40-42°C with consistent performance
edit: I tested and dug up some info about hevc recording and got the below results

[Alphonsokurukuchu]

hevc is being saved as mpeg H which is shortly being referred to as mp4(you can also check their size difference, exact same scene, 5 second video on 4k)

[IcyJay30]

Ohk thanks! Did you check in default gallery? Its showing me mp4 on both but there is a size difference so i think bug is in gallery instead of camera. 👀

[Alphonsokurukuchu]

Yeah it's being shown as mp4, I've encoded a few videos in my phone to hevc and they did show as mp4 so I thought they were just being shown as mp4 on short for abbreviation MPEG-H PART2
unless I check full detail even vlc is showing it as mp4

[Alphonsokurukuchu]

opengl one may need more games and stuff running on it to be tested, I've not seen any and some users reported better performance on genshin impact post android 11 and it uses opengl

[IcyJay30]

I only have 1 vulkan game(childern of light) its working fine,
but performance of codm and few more games degraded.
Ill try more games

[Abpal]

And in my m30s, it's freezing very hard when enemies are near in codm br mode.