@Mysti-Que2020 No update notification whatsoever, but I haven't touched any default Google Play settings or anything. Presumably it's doing all sorts of updates on its own.
Especially with the corroboration from @Rob. S., I'm more convinced it was a background software update that fixed the bug. The bug was so reliable, persistent, and reproducible beforehand, and now it's just completely gone without a trace. Considering that F(x)tec straight-up stated it was a firmware bug, and said that they had a fix coming, I'm inclined to believe them.
I haven't really done much to the phone si