Data from orphaned XA transaction is lost after online alter

--source include/have_innodb.inc

create table t (a int primary key) engine=innodb;

insert into t values (1);

--echo # XA commit

set debug_sync= 'alter_table_online_downgraded signal downgraded wait_for go';

send alter table t force, algorithm=copy, lock=none;

--connect(con1, localhost, root,,)

set debug_sync= 'now wait_for downgraded';

xa begin 'x1';

update t set a = 2 where a = 1;

xa end 'x1';

xa prepare 'x1';

--disconnect con1

--connect(con1, localhost, root,,)

xa commit 'x1';

set debug_sync= 'now signal go';

--connection default

--reap # alter table

select * from t;