@engeles20, @alerton123 So after my attempt this morning that didnt work, I saw this new post in another thread: IKEA Tradfri - Batteries in the remote controls are quickly discharged - #430 by FloatingBoater
Pretty much the same approach of using custom quirks, but apparently with a newer file ( from https://raw.githubusercontent.com/stickpin/zha-device-handlers/fbc724d8ac96471210efa8bfc2431b5f029f9094/zhaquirks/ikea/fivebtnremote.py)
I removed the remote from zha, removed the quirks file that engeles20 linked, added the new quirks file, restarted, re-added the remote and now all buttons work. Looks like these changes will be included in the next release 2023.3 and you should remove the custom quirks file once that drops.