Implicit effective date on changes only HCM Extract

Content

We have a changes only extract that appears to not be pulling some people. It is configured as a changes only extract and there is no effective date parameter passed on the schedule. Is there some implicit effective date that might be being used that causes some people not to be picked up due to the effective date on their row?

The reason they aren't being picked up seems to be something related to the sequence of the changes or the effective date of the changes. 

Version

21A