General info: It's home is BEBOY GOLD, I think it'll only change if there's an issue but we'll be able to find that out very easily using the website and the preview pages they release in advance. You don't need to be able to read Japanese as it's very straight forward.
Like so: http://www.b-boy.jp/next/gold_next/
The extra's are released I believe as fan-service while we wait for a new chapter that is delayed for whatever reason. I don't think there's necessarily any correlation between what kind of chapter goes into what magazine as there has been years when sensei has only had time to do extras anyway, as opposed to work full-pelt on the story (Like when her father died and following health problems) so the magazine probably took what they could get and assigned pages as and when she gave them.
VF always releases in Beboy Gold
I mingled between beboy gold and pink gold. thanks.
BE・BOY GOLD 2017年2月28 the nest chap will be in gold magazine?? coz BexBoy and B-boy will be released in march. most of the time finder in glod magazine is not about the main story but only extra! I hope I'm wrong.