This isn't a "bug" with the iOS keyboard, this is directed and intentional censorship.
Of course; but my point is just add it to the giant pile of problems with iOS's keyboard. Every part of it has bugs, broken stuff, or annoyances like this, it isn't fit for purpose, and needs significant work.
The fact Apple aren't embarrassed by the iOS keyboard is very surprising and disappointing.
Anything can be censorship if you want it to, and then it means nothing.
Apple is free to make their product work however they want. They're not creating laws or public utilities.