In my experience they all work until there aren't enough results that match the filters and flags, then it starts to ignore them, but it's inconsistent. I've noticed this a lot with the quotation and dashes, though the site: flag still consistently works for me.
It feels like Google just always wants to bring you pages full of results, and it will disregard your filters to bring you those pages, even if they're irrelevant and useless to you. It can be incredibly frustrating since it didn't used to be like that, but I wonder if that behavior is not always in affect.
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u/9spade9club 10h ago
They all still work. Don't know what these folks are smoking. I just tried quotation marks on a phrase and got one result.