Whizbang Dustyboots
Gnometown Hero
It was released as part of a set that included Xanathar's and Tasha's, as a supplement gift set for people who only owned the core books. (Pandemic supply chain issues meant it missed the holiday shopping season, though.) There was a hobby shop version with new covers and a new screen, but I don't recall anyone rushing out to buy the set if they already had Xanathar's and Tasha's. (I'm sure there were a few people who did that, but they're likely also the people who buy multiple copies of books already.)I may have my timetable wrong but wasn’t Monsters of the Multiverse part of a set that included a bunch of tweaks and updates?
I think most people just waited and got Monsters of the Multiverse later on.