I just asked for closure on the ticket I submitted here as it is probably not a bug.
I will say, if you reset your bios, you should expect it to take sometimes 2-3 minutes to re-train the memory. Almost every AMD chip in modern memory (up to and including Zen 1) will take some time after a reset to train and may even restart a couple of times. All I can say is you should give it enough time to boot if you’re having issues.