Sadly this is a known iOS PWA issue. Nothing wefwef can do about it. Hopefully it is (or will be) fixed in iOS 17.

The “blocks more ads” part is probably mostly because AdGuard allows you to add the “normal” blocklists that you find all around the Internet (plus it has a large collection of built-in ones already).

IIRC 1Blocker uses its own format, which isn’t as prevalent.

I use AdGuard. Used it for years - with brief stints of 1Blocker - and I feel like AdGuard blocks more ads and breaks less sites.