"If June is supposed to be Canon because of the hole Tumblerone thing"

June's canonicity isn't because of the Toblerone; Hussie had already been noted by their friends as being personally invested in the fandom-wide June headcanon and Toblerone Wishes weren't even a thing until *after* the June Egbert Real tweets. The Fanlore article on Egbert has some good citations if you want. https://fanlore.org/wiki/John_Egbert#Gender