https://bugzilla.kernel.org/show_bug.cgi?id=195581
--- Comment #2 from Lutz Vieweg (lvml@5t9.de) --- Indeed, https://bugs.freedesktop.org/show_bug.cgi?id=100375 looks like it is the same issue.
I cannot say whether this is a regression from an older kernel, because I only recently put this AMD RX-460 GPU into the system, and significantly older kernels don't work that well with Ryzen CPUs...