Official builds are tested with mysql-test-run --sleep=10, and the slave has (in mysql-test-run) a slave-net-timeout=10. So the 'sleep 1' below was converted in 'sleep 10', so slave thought that connection was down, so reconnected, so got an additional (fake) Rotate event, which shifted the positions displayed by SHOW SLAVE STATUS.
Official builds are tested with mysql-test-run --sleep=10, and the slave
has (in mysql-test-run) a slave-net-timeout=10. So the 'sleep 1' below
was converted in 'sleep 10', so slave thought that connection was down,
so reconnected, so got an additional (fake) Rotate event, which shifted
the positions displayed by SHOW SLAVE STATUS.

ollie314/server,flynn1973/mariadb-aix,davidl-zend/zenddbi,davidl-zend/zenddbi,davidl-zend/zenddbi,ollie314/server,natsys/mariadb_10.2,davidl-zend/zenddbi,davidl-zend/zenddbi,davidl-zend/zenddbi,flynn1973/mariadb-aix,flynn1973/mariadb-aix,natsys/mariadb_10.2,natsys/mariadb_10.2,slanterns/server,ollie314/server,ollie314/server,ollie314/server,natsys/mariadb_10.2,davidl-zend/zenddbi,natsys/mariadb_10.2,ollie314/server,flynn1973/mariadb-aix,davidl-zend/zenddbi,flynn1973/mariadb-aix,ollie314/server,davidl-zend/zenddbi,flynn1973/mariadb-aix,flynn1973/mariadb-aix,ollie314/server,natsys/mariadb_10.2,ollie314/server,natsys/mariadb_10.2,flynn1973/mariadb-aix,natsys/mariadb_10.2,flynn1973/mariadb-aix,flynn1973/mariadb-aix,ollie314/server,flynn1973/mariadb-aix,davidl-zend/zenddbi,natsys/mariadb_10.2,ollie314/server,natsys/mariadb_10.2,davidl-zend/zenddbi,natsys/mariadb_10.2