The 4.x branch is now currently the recommended branch for use in production websites. The 1.x branch is now in maintenance mode and will receive only security updates for the next 6 months.
On hook_cron, check exported (not confirmed) entities for last modified date.
Fixing bugs that prevent stub entities from creating properly and missing dependency calculations. Also fixed a small bug that prevents entity delete for subscriber trackers.
Updated Export Queue Worker to remove missing entities from the tracker.