Yes, using a different kernel can cause problems as well as solving other proplems. This is why it is highly recommended that users stick with the Vetted, Tested, Supported kernel.
And this is why I PM the patch I created to install 5.14 on Zorin OS - because otherwise, if I post it in full view, a bunch of people will try to install it seeing only stars In Their Eyes at a higher number. And they would probably run into problems that they would blame me for and demand I fix. Or worse, post their issue without disclosing the fact they used the 5.14 kernel leading us all on a merry chase.
GizzyVec and I tried the 5.14 as it is the only viable solution to the Missing Wifi.
However, we see here, clearly, the problem with moving outside of the Supported kernel.
In this case, I agree with Michel, the best option is to install the Nvidia Drivers without DKMS.
You could try the x-swat repo:
sudo add-apt-repository ppa:ubuntu-x-swat/updates
sudo apt update && sudo apt full-upgrade