sudo dmesg | grep mt7921e
mt7921e 0000:03:00.0: Unable to change power state from D3cold to D0, device inaccessible
mt7921e 0000:03:00.0: driver own failed
mt7921e 0000:03:00.0: probe with driver mt7921e failed with error -5
Works on kernel:
6.12.4-1-MANJARO
Not working on kernel:
6.12.19-1-MANJARO
Tried setting pci=nocrs flag in grub, but it bricks my system.
This is not what is usually meant by ‘bricking’ a system.
Let’s hope your system isn’t bricked as that infers it’s not just broken, but completely non-functional and beyond repair. 
Your post has been edited to conform with forum requirements for posting code and command output. In future posts you are expected to do this yourself. Follow links (below) to find information needed.
Regards.
Welcome to the Manjaro community
As a new or infrequent forum user, please take some time to familiarise yourself with Forum requirements, and the many ways to use the forum to your benefit:
The Update Announcements contain important information and a Known Issues and Solutions section that should generally be checked before posting a request for support.
Output of this command (formatted according to forum requirements) may be useful for those wishing to help:
inxi --filter --verbosity=8
or the short form:
inxi -zv8
Be prepared to provide more information and outputs from other commands whenever asked.
Regards.
A post was split to a new topic: WiFi mt7921e not working