Comments - Incorrect string value
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Can you create a https://dbfiddle.uk/?rdbms=mariadb_10.4 (or any applicable/available) example?
Are you sure the connection is a utf8 database connection?
Otherwise please do a bug report - https://jira.mariadb.org
Changing the console client charset (both mariadb client and application) and converting all the string fields to utf8mb4 worked. At the time I asked the question, it didn't appear to. I must have not restarted something.