There is no build-essentials, but build-essential (without 's' at end)
$ apt search build-essentials
Sorting... Done
Full Text Search... Done
$ apt search build-essential
Sorting... Done
Full Text Search... Done
build-essential/stable,now 12.6 amd64 [installed]
Informational list of build-essential packages
Yeah, I mistyped it in the header. Definitely does not work as "build-essential". I'm sure it's a missing repo but I've no idea where that lives, and Google has so far failed me.