Cant make rune pages with support in them

Misread the title; tested it, and, yeah, for some reason, Collection > _ Runes_ doesn't seem to allow the word "Support". That's really odd, to say the least.

I think it's a sign Riot does NOT want you playing Kennen support (jokes) but no really this weird. And apparently you can't type Mordekaiser if another post is correct. I'll be honest, I didn't even know mastery pages HAD censorship. Is this a new thing?