Semi-sync with Multi-source Checksum Verification Failure

[ERROR] Master 'c1': Slave I/O: Replication event checksum verification failed while reading from network, Internal MariaDB error code: 1743

# Configure environment as 1->3,2->3 with named channels c1, c2 respectively

# c1 is semi-sync enabled, c2 is semi-sync disabled

# binlog_format independent

--source include/have_binlog_format_statement.inc

--let $_rpl_server= 3

while ($_rpl_server)

{

  # Connect.

  --let $rpl_server_number= $_rpl_server

  --let $rpl_connection_name= server_$_rpl_server

  --source include/rpl_connect.inc

  # Configure server.

  --let $rpl_connection_name= server_$_rpl_server

  --source include/rpl_connection.inc

  USE test;

  RESET MASTER;

  SET GLOBAL gtid_slave_pos= "";

  RESET SLAVE;

  --dec $_rpl_server

}

--connection server_1

set global rpl_semi_sync_master_enabled= 1;

set global rpl_semi_sync_master_timeout= 1000; # 1 second because the replica will err, so we don't want to wait

--connection server_2

set global rpl_semi_sync_master_enabled= 0;

--connection server_3

--eval change master 'c1' to master_host='127.0.0.1',master_port=$SERVER_MYPORT_1,master_use_gtid=slave_pos, master_user='root';

--eval change master 'c2' to master_host='127.0.0.1',master_port=$SERVER_MYPORT_2,master_use_gtid=slave_pos, master_user='root';

set global rpl_semi_sync_slave_enabled=1;

start slave 'c1';

--connection server_1

--echo # Waiting for slave to connect to server 1

--let $status_var_value= 1

--let $status_var= rpl_semi_sync_master_clients

--source include/wait_for_status_var.inc

--connection server_3

--echo # Disable semi_sync on the slave mid-way through

set global rpl_semi_sync_slave_enabled=0;

start slave 'c2';

set default_master_connection='c2';

--source include/wait_for_slave_io_to_start.inc

--connection server_1

create table t1 (a int);

# Err 1743 is ER_NETWORK_READ_EVENT_CHECKSUM_FAILURE

--let $err_txt= error code: 1743

--let $assert_text= Check that there is no '$err_txt' in error log.

--let $assert_select= $err_txt

--let $assert_file= $MYSQLTEST_VARDIR/log/mysqld.3.err

--let $assert_count= 0

--let $assert_only_after=CURRENT_TEST

--source include/assert_grep.inc

--echo #

--echo # Cleanup

--connection server_3

stop slave 'c1';

stop slave 'c2';

set global rpl_semi_sync_slave_enabled=0;

--connection server_1

set global rpl_semi_sync_master_enabled=0;

drop table t1;

--connection server_2

set global rpl_semi_sync_master_enabled=0;

drop table t2;

--connection server_3

start slave 'c1';

start slave 'c2';

--source include/rpl_end.inc

--echo # End of test