The 12.2 AWI does not allow changing the status of a blocked task to ENDED_OK from within the workflow monitor. A red error message "The status of task 'xxxxxx' has been changed meanwhile', however the status does not change. The change is accepted by using the list view in the Monitoring Perspective.
This will be removed as an option from the AWI in cases involving workflow dependencies, as the correct way is to only be able to change the status from the activity window and not from the process monitor. This will tentatively be changed in the following versions:
Automic Web Interface 12.3.0 - planned release for June 28, 2019
Automic Web Interface 12.2.2 - planned release for February 28, 2019