Wrong error code/message while encrypting a partitioned InnoDB table

plugin-load-add=file_key_management.so 

file_key_management_filename=/home/elenst/git/10.1/mysql-test/std_data/keys.txt 

innodb-encrypt-tables=FORCE

MariaDB [test]> create table t1 (i int) engine=InnoDB;

Query OK, 0 rows affected (0.52 sec)

MariaDB [test]> alter table t1 encrypted=NO;

ERROR 1005 (HY000): Can't create table `test`.`#sql-5524_3` (errno: 140 "Wrong create options")

MariaDB [test]> alter table t1 encrypted=YES;

Query OK, 0 rows affected (1.05 sec)               

Records: 0  Duplicates: 0  Warnings: 0

MariaDB [test]> create table t2 (i int) partition by hash(i) partitions 2;

Query OK, 0 rows affected (1.09 sec)

MariaDB [test]> alter table t2 encrypted=NO;

ERROR 1478 (HY000): Table storage engine 'InnoDB' does not support the create option 'ENCRYPTED'

MariaDB [test]> alter table t2 encrypted=YES;

Query OK, 0 rows affected (1.71 sec)

Records: 0  Duplicates: 0  Warnings: 0

MariaDB [test]> show variables like '%encrypt%';

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

| Variable_name                            | Value   |

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

| aria_encrypt_tables                      | OFF     |

| encrypt_tmp_disk_tables                  | OFF     |

| file_key_management_encryption_algorithm | aes_cbc |

| innodb_default_encryption_key_id         | 1       |

| innodb_encrypt_log                       | OFF     |

| innodb_encrypt_tables                    | FORCE   |

| innodb_encryption_rotate_key_age         | 1       |

| innodb_encryption_rotation_iops          | 100     |

| innodb_encryption_threads                | 0       |

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

9 rows in set (0.01 sec)