asymmetric_encrypt() UDF does not work with external RSA public key

mysql> CREATE TABLE key_holder (priv varchar(2000), pub varchar(2000));
Query OK, 0 rows affected (0.06 sec)

mysql> INSERT INTO key_holder VALUES (LOAD_FILE('/home/mohit.joshi/PS-7044/bld_01apr_2022/install/rsa.private'), LOAD_FILE('/home/mohit.joshi/PS-7044/bld_01apr_2022/install/rsa.public'));
Query OK, 1 row affected (0.03 sec)

mysql> SELECT priv FROM key_holder INTO @external_priv;
Query OK, 1 row affected (0.01 sec)

mysql> SELECT pub FROM key_holder INTO @external_pub;
Query OK, 1 row affected (0.00 sec)

mysql> SET @str='Aaa';
Query OK, 0 rows affected (0.00 sec)

mysql> SET @ciphertext=asymmetric_encrypt('RSA',@str,@external_pub);
ERROR 3200 (HY000): asymmetric_encrypt<string> UDF failed; cannot import RSA key from PEM PUBLIC KEY: error:0909006C:PEM routines:get_name:no start line

mysql> SET @pub=create_asymmetric_pub_key('RSA',@external_priv);
Query OK, 0 rows affected (0.00 sec)

mysql> SET @ciphertext=asymmetric_encrypt('RSA',@str,@pub);
Query OK, 0 rows affected (0.00 sec)