Three support tickets later we were able to identify this workflow! This certainly needs a notice on the status page about the undocumented use of this status, as well as a toggle to turn off.

The ability to assign fields to groups (like statuses) AND lock a field if it is tied to an integration. Could be done via a check box that requires an extra step to unlock and edit so the user is fully aware that they will be revising a field and will need to adjust Fusion or other API's as well.

We have the same issue in reverse if we complete tasks ahead of schedule... https://experience.workfront.com/s/idea/0870z000000XhzWAAS/detail

As a worker I want the actual start date of a task with the constraint of finish-start to bump to current time when I complete a predecessor task ahead of the planned schedule. Given I finish my consultation call ahead of schedule, I want my next design task to fall within my standard SLA window of ...

Campaign relationship like this would be huge for our creative services projects... bring this back to life!