Actually a better filter performance-wise would be:

||it^$3p,requestdomain=~example.it

Since the keyword it can be extracted from it.

@gorhill When I add ||google.com^$to=com or ||google.com^$from=com navigation is blocked by document-blocked page. Is this a bug too like the one with $method ?

I get the same result with ||google.com^$domain=com in 1.45.2, so not something new. That sort of filter is not very realistic though, not sure I want to throw code at this to avoid document-blocked page for such unrealistic filters.

Yeah I came across this when I was testing $to and $from with all kinds of filters, I never deploy such filters myself though.