I just updated my phone to iOS 13.3 yesterday (was switching from unc0ver 12.4 semi-untethered jailbreak to checkra1n semi-tethered jailbreak) and my AirPods upgraded to this firmware.

> But affected customers say the trouble began even earlier with firmware version 2B588, which rolled out in November. (Apple later pulled firmware 2C54 for unknown reasons.)

It made its way on to my airpods. They haven't pulled hard enough until they make it go away in the wild.