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It’s a minimum word length issue, yes. Some emoji are actually two characters. For example ✊🏿 is “fist character” and “black skin tone character”. Some are just one character, like ✊.
You must adjust the minimum word length to 1 from Relevanssi advanced indexing settings and then allow one-letter searches with:
add_filter( 'relevanssi_block_one_letter_searches', '__return_false' );
So it is possible… thank you!