CREATE TABLE SELECT JSON_QUOTE(multibyte_charset_expr) makes a field of a wrong length

CREATE OR REPLACE TABLE t1 AS SELECT

  JSON_QUOTE(_latin1'foo') AS c1,

  JSON_QUOTE(_utf8'foo') AS c2;

SHOW CREATE TABLE t1;

+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

| Table | Create Table                                                                                                                                                                                                    |

+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

| t1    | CREATE TABLE `t1` (

  `c1` varchar(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin DEFAULT NULL,

  `c2` varchar(28) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+