Steps to reproduce:

1. Gather Stuff. USB keyboard, USB mouse, OTG Adapter and USB hub.
2. Make sure that all stuff are compatible with your device. My stuff is compatible. Put them all together lol.
3. Go to any world or server.
4. Please Observe and follow steps Carefully.{}
   1. To distinguish, firstly move your mouse as free as you want without pressing the keyboard yet.
   2. Press any letter on your keyboard except those keys you are using to move like "wasd". Press m for instance.
   3. Keep your finger on the key and start to move your mouse. Try to look around and aim on something.

Observed: Choppy Aim while keyboard is pressed and mouse is aiming simultaneously.

Expected: The aim should be as in Windows 10/11 Minecraft. no choppy aim

Any mice is affected. Any phone, any brand, any model.

Temporary Fix 
1. key mapper app https://play.google.com/store/apps/details?id=io.github.sds100.keymapper
2. Tutorial: https://youtu.be/k2vhDmSxm3Q  If you don't want to watch a YouTube video, basically Install this app from the Play Store and set it up. Make sure to turn it's accessibility permission on and make sure to set Keymapper Basic Input Method as your default keyboard. After that, you should remap every key that you use in the game like w, a, s, d, space, shift, ctrl etc... To a button that is held down and not repeating.

Do not reproduce in a VM. Do it at a regular Android Phone.

This bug is due to long pressing a keyboard creates a repetition on what you type like waaaadasdwaad  dwaaaa aaaads ssssssawwwd. AND MINECRAFT HATES THAT. And so it happens.

All Minecraft need is an accessibility permission in the settings to get direct feed from the physical keyboard.

Hope I helped! Have a great day.