It also affects play store mcpe version 1.21.1 ðŸ˜
This is not resolved i don't know why mod marked it as resolved but the issue is still present without a doubt.
Also My phone is Iqoo 11, 16gb ram 256 gb storage
LPDDR5X ram, UFS 4.0 storage, this have two processors snapdragon 8gen 2 and V2 chip
Sorry it was kind of hard for me to find the post so I made my own(more clarified)
To @CookieCft and others I found a work around for this issue, since I am using razer mice I can change mouse button functions in razer's mice customisation app. So, I assigned 2 of the keyboard buttons (eg:- 9 and 8) to each side buttons and now it registers as 9 and 8 for hotbar slot but technically now I am able to use both of the side mouse buttons. So I don't know how it is for Logitech and others check in YouTube how to assign keyboard keys to your specific mouse . Hopefully this helps . Doesn't mean that issue is completely resolved it is just a work around because it is supposed to work without all of these done.