The Boyz debuted late 2017, Wannaone debuted in the Middle of the year. That's a 9 month difference. They were considered 3rd gen at the time because no one was talking about the start of 4th gen until TXT and ITZY debuted. 2017-18 was more than enough time for the next generation to start.
The Boyz* not the boys.
just gonna leave this here and there are more similar articles about this 4th gen discussions
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