Validation message display wrong

Description

When changing the start publish date (PageStartPublish) on a page which has a stop publish date set before the adjust start date, a validation message appears. If the user then corrects the stop publish date by either removing it or setting it further in the future than the start publish date, the validation message does not disappear.

If you change some other property which causes the autosave to trigger, the validation message disappears.

Steps to reproduce:

1. Tools -> Manage Expiration and Archiving. Set Expire date to 2018-04-01 in the popup.

2. Go to settings tab and set Publish date to 2018-05-01 -> Autosave and validation message appears: Expiration date cannot be prior to the published date.

3. Remove the Expiration date or set it ahead of the published date.

Expected: The validation message disappears when removing the Expiration date or setting it ahead of the published date.

Actual: A validation message still appears.