Direct upgrade from 4.4 to 8.0 isn't supported in MongoDB. When you upgrade from 4.4 to 8.0, this is the path you should follow:

4.4 - 5.0 - 6.0 - 7.0 - 8.0

Quoting from the 8.0 release notes:

Upgrade Version Path

To upgrade an existing MongoDB deployment to 8.0, you must be running a 7.0-series release.

To upgrade from a version earlier than the 7.0-series, you must successively upgrade major releases until you have upgraded to 7.0-series. For example, if you are running a 6.0-series, you must upgrade first to 7.0 before you can upgrade to 8.0.

Refer the 8.0 release notes for detailed instructions.