Can I go to immigration one day later than the date on the "Under Consideration" stamp without issues?

I'll agree that realistically it's probably fine... btw, what extension are you under consideration for?

Personally, I wouldn't chance going late.

If your extension is until 29 July, I'd go on the 27th rather than the first of August 😉

YMMV

Should be before ,not later

Correct me if I'm wrong but I assume the under consideration stamp date they give you is the date you go otherwise you go into overstay ?

Realistically, it's probably fine.

But immigration isn't really something you want to take a chance with. If you catch the wrong officer that hit traffic that morning, they might decide to make your day as bad as theirs.

Also there's a lot of holidays coming up, so you'd want to check that and make extra certain you don't end up being much more than 1 day late because the offices are closed.