Watching this forum I have seen errors reported on the 5.14.14 & 5.14.15 kernels.
I suspect that if you were to install a kernel of around the 5.14.10 - 5.14.13 vintage things would work ok for you.
I do wonder why you do not have an older kernel in the grub menu for either fc34 or fc33 though. Fedora by default keeps the last 3 installed kernels (plus the rescue kernel) and I only see the 5.14.15 kernel there for both 34 & 33.