@marghedsmet I think the author wants to put more content on one day, and then maybe later just skip a few uneventful ones. This dinner ark started 4 chapter ago. Quite meta in my opinion, but a bit confusing.
With good time management he could have made single page 4koma with daily advance and then do this day with extra pages without breaking the 100 days format.
But then again it must be a pain to keep this manga while doing Tonikaku at the same time.
I'd rather the author tell the story the way they want to, rather than strictly follow the format and compromise the story they want to tell by doing so.