Pluggable DOUBLE type lost on CTAS through plugin FIRST() aggregate

INSTALL SONAME 'func_test';

INSTALL SONAME 'type_test';

CREATE TABLE t1 (d test_double);

INSERT INTO t1 VALUES (1.5);

CREATE TABLE t2 AS SELECT test_plugin_first(d) AS first_d FROM t1;

SHOW CREATE TABLE t2\G

#cleanup

DROP TABLE t2, t1;

UNINSTALL SONAME 'type_test';

UNINSTALL SONAME 'func_test';

13.1.0-dbg>INSTALL SONAME 'func_test';

Query OK, 0 rows affected (0.011 sec)

13.1.0-dbg>INSTALL SONAME 'type_test';

Query OK, 0 rows affected (0.005 sec)

13.1.0-dbg>CREATE TABLE t1 (d test_double);

Query OK, 0 rows affected (0.013 sec)

13.1.0-dbg>INSERT INTO t1 VALUES (1.5);

Query OK, 1 row affected (0.002 sec)

13.1.0-dbg>CREATE TABLE t2 AS SELECT test_plugin_first(d) AS first_d FROM t1;

Query OK, 1 row affected (0.010 sec)

Records: 1  Duplicates: 0  Warnings: 0

13.1.0-dbg>SHOW CREATE TABLE t2\G

*************************** 1. row ***************************

       Table: t2

Create Table: CREATE TABLE `t2` (

  `first_d` double DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci

1 row in set (0.000 sec)

13.1.0-dbg>

13.1.0-dbg>CREATE TABLE t2_plain AS SELECT  d FROM t1;

Query OK, 1 row affected (0.015 sec)

Records: 1  Duplicates: 0  Warnings: 0

13.1.0-dbg>SHOW CREATE TABLE t2_plain\G

*************************** 1. row ***************************

       Table: t2_plain

Create Table: CREATE TABLE `t2_plain` (

  `d` test_double DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci

1 row in set (0.000 sec)

13.1.0-dbg>