Remember Megami Cafe? Seo-sensei also did something like this too in the middle of series and he stretch the Hell of the story and that flash forward even made an appearance again as a semi joke 🤦.. And right now the flash forward in that series doesn't make any sense because he keeps adding new girls that does not even in the photograph in the flash forward..
And for the worst part in the previous chapter of this manga.. Anbe-Sensei also the drop the most confusing flash forward than anybody ever does. And It's has high chance Daisuke in the 10 years after is somehow still single because Asahi sensei tried to seduce him 10 years later and Chiaki pretty much got jealous because of that..
Basically the author still thinking how this series gonna end.. Is it gonna be branched ending, Open Ending, One Heroine Ending (This is pretty weird to happen because of what Asahi and Chiaki did in the chapter 360) or Harem Ending.