User blog comment:Thomasfan502/Season 8 Discussion Blog/@comment-2056915-20181210034027/@comment-2056915-20181211014028

I don't think so. When PopPixie appeared after the Winx departed from Pixie Village (season 4), and when the pixies returned (season 6) with PopPixie outfits instead of their old clothes, it has already been theorized two shows loosely linked -- like remove all illogical things like male and female pixies or they have parents and such, the events in PopPixie might take place in season 4 and 5 of Winx Club, right after the Winx leave to search for Roxy and then save the Magic Universe from Tritannus. That's semi-canon. And now the comic confirms this with Pixie Plaza appearance, making it canon (again, without some illogical things).

World of Winx stuffs (I think Dreamix and Onyrix and also, civilian style) appear in the comic, means it's semi-canon for now. If any flashback in season 8 or later season mentioned about anything in World of Winx, it's canon, without illogical things, of course.