Maybe I’m just confused here, but I have a Stalled Perspective setup and for some reason when I add an action to a stalled project, it disappears from the list before I get a chance to actually fill out the action.
My OF preferences have “Clean up changed items” set to “When changing perspectives.”
You are not doing anything wrong really. It happens to me, too.
What I am doing as a workaround: Press Cmd-Alt-R to get to the project that is stalled. Than, add the action there and return to the Stalled perspective.