We're getting an interesting validation error after upgrading from Sitecore 8.2 Update-6 to Sitecore 9 Update-2.
We have the standard Required validator on a field (item name of the field is Title). When the workflow validation triggers it says the field has no value, but doing a manual validation shows that it validates fine.
In both the editor and the admin dbbrowser tool the field has a value. Checking the item template's raw values I've confirmed that the validation points to the same items.
The validation on this field hasn't changed in any way since we were on Sitecore 8.2 Update-6, nor has the workflow, and going back to old items and trying to publish them no longer works, because of the same validation issue.
How can I determine where Sitecore 9.x is now getting the idea that the populated field doesn't actually have a value, with the out of the box Required validator?
