JSON_ARRAYAGG includes wrong TEXT row

CREATE TABLE `yyy_mariadb_bug` (

        `group_id` INT(11) NULL DEFAULT NULL,

        `row_id` INT(11) NULL DEFAULT NULL,

        `varchar_val` VARCHAR(25) NULL DEFAULT NULL,

        `text_val` TEXT NULL DEFAULT NULL

) ENGINE=InnoDB;

INSERT INTO `yyy_mariadb_bug` (`group_id`, `row_id`, `varchar_val`, `text_val`) VALUES (1, 1, 'varchar_group_1_row_1', 'text_group_1_row_1');

INSERT INTO `yyy_mariadb_bug` (`group_id`, `row_id`, `varchar_val`, `text_val`) VALUES (1, 2, 'varchar_group_1_row_2', 'text_group_1_row_2');

INSERT INTO `yyy_mariadb_bug` (`group_id`, `row_id`, `varchar_val`, `text_val`) VALUES (2, 1, 'varchar_group_2_row_1', 'text_group_2_row_1');

INSERT INTO `yyy_mariadb_bug` (`group_id`, `row_id`, `varchar_val`, `text_val`) VALUES (2, 2, 'varchar_group_2_row_2', 'text_group_2_row_2');

SELECT * FROM yyy_mariadb_bug;

SELECT group_id, JSON_OBJECT(

'arr',(SELECT JSON_ARRAYAGG(JSON_OBJECT(

'v',varchar_val,

't',text_val)))) as json_arr FROM yyy_mariadb_bug GROUP BY group_id;

group_id        row_id  varchar_val     text_val

1       1       varchar_group_1_row_1   text_group_1_row_1

1       2       varchar_group_1_row_2   text_group_1_row_2

2       1       varchar_group_2_row_1   text_group_2_row_1

2       2       varchar_group_2_row_2   text_group_2_row_2

group_id        json_arr

1       {"arr": [{"v": "varchar_group_1_row_1", "t": "text_group_1_row_1"},{"v": "varchar_group_1_row_2", "t": "text_group_1_row_1"}]}

2       {"arr": [{"v": "varchar_group_2_row_1", "t": "text_group_2_row_1"},{"v": "varchar_group_2_row_2", "t": "text_group_2_row_1"}]}

group_id        json_arr

1       {"arr": [{"v": "varchar_group_1_row_1", "t": "text_group_1_row_1"},{"v": "varchar_group_1_row_2", "t": "text_group_1_row_2"}]}

2       {"arr": [{"v": "varchar_group_2_row_1", "t": "text_group_2_row_1"},{"v": "varchar_group_2_row_2", "t": "text_group_2_row_2"}]}

 {"v": "varchar_group_1_row_2", "t": "text_group_1_row_2"}

 {"v": "varchar_group_2_row_2", "t": "text_group_2_row_2"}

 {"v": "varchar_group_1_row_2", "t": "text_group_1_row_1"}

 {"v": "varchar_group_2_row_2", "t": "text_group_2_row_1"}