The following changes between MySQL 5.6.43 and MySQL 5.6.44 touch InnoDB files.
Bug#28867993: POSSIBLE ISSUE WITH MYSQL SERVER RESTART
Already fixed in MariaDB in a less intrusive way.
Bug #19811005 ALTER TABLE ADD INDEX DOES NOT UPDATE INDEX_LENGTH IN I_S TABLES
This is an one-liner fix to InnoDB persistent statistics, with a test case that fails in MariaDB, possibly due to missing some interface changes.
Bug#28573894 ALTER PARTITIONED TABLE ADD AUTO_INCREMENT DIFF RESULT DEPENDING ON ALGORITHM
This fixes a bug in the InnoDB-native ALTER TABLE for partitioned tables. There are some changes outside InnoDB as well.
Side note: MDEV-19330 is a related upstream bug that affects non-partitioned tables as well.