START SLAVE zeroes `Rpl_semi_sync_slave_send_ack` even if a multi-source connection is active

--connect (master, 127.0.0.1, root, , , $SERVER_MYPORT_1)

SET @@GLOBAL.rpl_semi_sync_master_enabled= 1;

RESET MASTER;

--connect (master_other, 127.0.0.1, root, , , $SERVER_MYPORT_2)

SET @@GLOBAL.rpl_semi_sync_master_enabled= 1; # MDEV-32947

RESET MASTER;

--connect (slave, 127.0.0.1, root, , , $SERVER_MYPORT_3)

--disable_warnings

  SET @@GLOBAL.gtid_slave_pos= '';

--enable_warnings

--replace_result $SERVER_MYPORT_1 SERVER_MYPORT_1

eval CHANGE MASTER TO

  master_host='127.0.0.1', master_port=$SERVER_MYPORT_1, master_user='root';

SET @@SESSION.default_master_connection= 'other';

--replace_result $SERVER_MYPORT_2 SERVER_MYPORT_2

eval CHANGE MASTER TO

  master_host='127.0.0.1', master_port=$SERVER_MYPORT_2, master_user='root';

SET @@GLOBAL.rpl_semi_sync_slave_enabled= 1;

START SLAVE '';

--connection master

  --let $status_var= Rpl_semi_sync_master_clients

  --let $status_var_value= 1

  --source include/wait_for_status_var.inc

  CREATE TABLE t (a INT);

  DROP TABLE t;

--sync_slave_with_master

SHOW STATUS LIKE 'Rpl_semi_sync_slave_send_ack'; #=> 2

START SLAVE IO_THREAD;

--source include/wait_for_slave_io_to_start.inc

SHOW STATUS LIKE 'Rpl_semi_sync_slave_send_ack'; #=> Expected: 2; Actual: 0

--source include/stop_slave_io.inc

RESET SLAVE ALL;

SET @@SESSION.default_master_connection= '';

--source include/stop_slave.inc

RESET SLAVE ALL;

SET @@GLOBAL.rpl_semi_sync_slave_enabled= 0;

--disconnect slave

--connection master

SET @@GLOBAL.rpl_semi_sync_master_enabled= 0;

--disconnect master

--connection master_other

SET @@GLOBAL.rpl_semi_sync_master_enabled= 0; # MDEV-32947

--disconnect master_other