Hello!
I just recently had a VERY similar problem on my i9 XPS15, where the installer worked, but wifi didn’t work anymore after install.
I was able to identify issues with the ath11k module via dmesg-
sudo dmesg | grep -i ath11k
This showed that I had memory page_alloc errors. I then added ‘memmap=12M\$20M’ to my /etc/default/grub, and regenerated it.
My wifi card then worked nominally.
For additional info, see:
https://wiki.archlinux.org/title/Dell_XPS_13_(9310)