In the config app (/modules/workflow/dialogs/publish/form), it is possible to configure the publication dialog (for instance to add one field).

However, if we have a look to the related dialog presenter (info.magnolia.module.workflow.action.WorkflowFormDialogPresenter), in the configureDialogActions method, my action definition object will be copied over a WorkflowPublicationActionDefinition one.

As my new field does not exist in WorkflowPublicationActionDefinition, it will not be transmitted to the publication task and I will not be able to display it in the publication task dialog.