We recently observed that tables that had BINARY types were getting converted to string types in their Avro schema registry schemas. We see this log line:

 Nov 08 15:16:57 tst-kafkaDEBUG - field ‘some_uuid' (STRING) from column some_uuid BINARY(16) CHARSET utf8 NOT NULL (io.debezium.relational.TableSchemaBuilder)

It looks like this line is the culprit.