@descending_angel87 It was 30 pages, not 20. But yeah, it's also a thing with the company, Twi4 promises 4koma manga everyday all the 365 days on Twitter, as you can see here: https://mangadex.org/chapter/443793/26
So it's not the mangaka deciding the format but the publisher.
The couple manga chapters that don't follow a 4koma structure Chuggoth mentioned were some extra that weren't published by Twi4, they were only rough drafts the author uploaded to his own Twitter himself.