I'd like to suggest you change the editor config.php to suggest utf8mb4 instead of utf8 as mysql utf8 isn't.
"dsn" => "charset=utf8mb4", // PHP DSN extra information. Set as charset=utf8 if you are using MySQL
Looking this up, it appears that MySQL's utf8 supports only three bytes, rather than the four required for full UTF8. I had no idea that was the case - thanks for letting me know about this. There is, as far as I can tell, no compatibility issue, so I've updated the documentation locally and will have it deployed along with the next release.
Thanks for the suggestion,
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