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Nah, notice how Foursome AND Fivesome have that F in there? Right in the beginning of the word. If you squint you can even saw that it is bold.
So OP is perfectly right while you are going confidently incorrect.
That’s the tag name, not the tag id. It’s only finding on tag id. Yes, you’re right, Foursome and Fivesome are getting highlighted, but it is still only going to give you results that match the id.
Just because someone disagrees or may be incorrect doesn’t make them “confidently incorrect”, including you or me. It’s just aggressively looking for argument where it’s inappropriate or unwanted.