Replication breaks when dropping a column of a combined primary key (with a confusing error message)

MariaDB [test]> create table t1(i1 int not null,f1 varchar(10) not null, f2 varchar(20) not null, f3 varchar(30), primary key (i1,f1,f2));

Query OK, 0 rows affected (0.01 sec)

MariaDB [test]> show create table t1;

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

| Table | Create Table                                                                                                                                                             |

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

| t1    | CREATE TABLE "t1" (

  "i1" int(11) NOT NULL,

  "f1" varchar(10) NOT NULL,

  "f2" varchar(20) NOT NULL,

  "f3" varchar(30) DEFAULT NULL,

  PRIMARY KEY ("i1","f1","f2")

) |

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

1 row in set (0.00 sec)

MariaDB [test]> alter table t1 drop column f1;

Query OK, 0 rows affected (0.02 sec)

Records: 0  Duplicates: 0  Warnings: 0

MariaDB [test]> select @@version;

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

| @@version       |

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

| 10.1.29-MariaDB |

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

1 row in set (0.00 sec)

MariaDB [test]> show create table t1;

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

| Table | Create Table                                                                                                                                                             |

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

| t1    | CREATE TABLE "t1" (

  "i1" int(11) NOT NULL,

  "f1" varchar(10) NOT NULL,

  "f2" varchar(20) NOT NULL,

  "f3" varchar(30) DEFAULT NULL,

  PRIMARY KEY ("i1","f1","f2")

) |

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

1 row in set (0.00 sec)

MariaDB [test]> show slave status\G

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

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 192.168.56.101

                  Master_User: repl

                  Master_Port: 3306

                Connect_Retry: 60

              Master_Log_File: mysql-bin.000005

          Read_Master_Log_Pos: 17541

               Relay_Log_File: relay-bin.000003

                Relay_Log_Pos: 1072

        Relay_Master_Log_File: mysql-bin.000005

             Slave_IO_Running: Yes

            Slave_SQL_Running: No

              Replicate_Do_DB: 

          Replicate_Ignore_DB: 

           Replicate_Do_Table: 

       Replicate_Ignore_Table: 

      Replicate_Wild_Do_Table: 

  Replicate_Wild_Ignore_Table: 

                   Last_Errno: 1072

                   Last_Error: Error 'Key column 'f1' doesn't exist in table' on query. Default database: 'test'. Query: 'alter table t1 drop column f1'

                 Skip_Counter: 0

          Exec_Master_Log_Pos: 17403

              Relay_Log_Space: 1993

              Until_Condition: None

               Until_Log_File: 

                Until_Log_Pos: 0

           Master_SSL_Allowed: No

           Master_SSL_CA_File: 

           Master_SSL_CA_Path: 

              Master_SSL_Cert: 

            Master_SSL_Cipher: 

               Master_SSL_Key: 

        Seconds_Behind_Master: NULL

Master_SSL_Verify_Server_Cert: No

                Last_IO_Errno: 0

                Last_IO_Error: 

               Last_SQL_Errno: 1072

               Last_SQL_Error: Error 'Key column 'f1' doesn't exist in table' on query. Default database: 'test'. Query: 'alter table t1 drop column f1'

  Replicate_Ignore_Server_Ids: 

             Master_Server_Id: 100215

               Master_SSL_Crl: 

           Master_SSL_Crlpath: 

                   Using_Gtid: No

                  Gtid_IO_Pos: 

      Replicate_Do_Domain_Ids: 

  Replicate_Ignore_Domain_Ids: 

                Parallel_Mode: conservative

                    SQL_Delay: 0

          SQL_Remaining_Delay: NULL

      Slave_SQL_Running_State: 

1 row in set (0.00 sec)

MariaDB [test]> alter table t1 drop column f1;

ERROR 1072 (42000): Key column 'f1' doesn't exist in table

MariaDB [test]> select @@version;

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

| @@version           |

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

| 10.2.11-MariaDB-log |

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

1 row in set (0.00 sec)