You have likely neglected to upgrade the feature compatibility level during your upgrades from 3.6 thru 4.4.1
Mongod should have written out the last version that successfully ran your database. Check this post for some information on that. How to check mongo version from volumes that I've set in the docker-compose.yml file? - #2 by chris
Once you get it running change the FCV as per the upgrade guide for the version running. This is found in the release notes section of the manual.