The update from tc-13 -> tc-14 is about updating the base libs - i.e. glibc, gcc, zlib, etc - and the kernel.
It doesn't look like the kernel graphics drivers are causing your problem, so it must be some combination of mesa, xorg-server and llvm.
Due to problems with intel hd4400 graphics, in tc-14 mesa was updated from 21.3.4 - > 22.3.3 and xorg-server to the latest version, but this did not fix the problem and the problem differs between 32bit/64bit.
The release notes for mesa-22.3.4 show one radeon fix, but it doesn't look like your issue.
You could try using tc-13 mesa extensions in tc-14 or try recompiling mesa-22.3.3 with debug flags to see if you learn more - I don't believe any of us has the hardware to test.