BEFORE: When I had a query with Tasks on a certain Project, when I hit "+New" in the corner, the name of the Project and Client would automatically be set to the current one (because the query was filtered on those).
NOW: I have changed the query reference of the Project to "This object" and now that property doesn't autofill anymore.
Furthermore I can't choose Client as a filter. It is a lookup property, so perhaps that is not (yet) supported as variable references?