"❌" Appears as "□" with Unicode Font.

I think that is normal, because in minecraft you can't use emoji or smiles. But if I'm wrong, please don't be offended)

It only affects unicode font... It's just a character which has been added to the normal minecraft font, but not the unicode font.

Isn't this just MC-197772?

Yup.

Thank you for your report!
We're tracking this issue in MC-197772, so this ticket is being resolved and linked as a duplicate.

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