For segmentation there is a note in documentation:
"Please note: Any changes made to the list within the last hour will not be considered in your test. However, this is not the case if a segment is used to send a campaign."

This not is only written in segmentation documentation and nowhere else which if someone missed it makes segment calculation results confusing.

it would be worth adding this information to all places where segmentation is described - eg. im working with API, would be nice to see this note also there and even better also show it on segmentation creation where i can do test calculation (and on campaign draft where calculated segment results are also showing)