It's not any common or even "normal" behaviour if it happened it was some serious bug or some bios issue. I can't imagine it was triggered by the cpu, heard pretty nonsense to me.
I did some low temp tests in the past and never seen anything, just partly similar, crazy voltage growth for decreasing temps.
Used the EDC bug for pretty long period, however a bit different point of view. Used it because the more aggressive boosting behaviour but not the fully max-out way. Positive offset wasn't acceptable for me as 24/7, not for such a small gain, like another 50 Mhz. It was boosting far higher and better than stock with negative offset even. That was the way I prefferred those days. My cpu lived all its life more or less above stock specs. When I ended up the EDC trick, I did that because bclk oc was corrected and enabled again. So I was moving to another way of tune but the main thing is my cpu is still working just as it did in the first moments. Nothing harmful can be seen and I still used to say, You can hardly harm your Ryzen till not cutting off from responding to really harmful situations. All the disasters what I've heard happened fixed clocks, fixed voltages. Still haven't seen posts / news about cpus died or degraded with boost settings. Ok, I'm sure if You trying real hard it can be harmful somehow but I think it's pretty not easy. As I've found my cpu even with a more aggressive EDC setting was clearly reacted to really high loads just like high temps. It's far not early and not such an extent but clearly did it and if things would be more critical, more safety reactions could be seen. Sometimes it's fully enough if You solve "just" a single serious factor and wouldn't be any trouble. Cpu degradations always need a few bad things happening the very same time. High temp, High current, high load and a higher voltage just made this even worse but without high current or high temps ( I mean really highm, dangerously high) usually nothing happens.
Cpu on cold :
