I'm aware that many movies, especially large-budget films, are developed under working titles, such as "Ebb Tide" for Jurassic World." or "Red Cup" for Solo. The Wikipedia entry and other sources describe various reasons for having working titles, ranging from the final title not being set to avoiding price gouging.
What I'm wondering is if there is an expressed rationale for using the working title (and sometimes logo) during production on the clapper when scenes are being shot. For example, here's the clapper for "Doctor Strange in the Multiverse of Madness" AKA "Doctor Strange 2" as seen in the "making of" documentary on Disney Plus, showing the title "Stellar Vortex."
I can imagine several reasons -- crew morale, maintaining continuity with code names used in other documents, even publicity stunts, not given effects houses footage with the official title that could leak -- but I'm looking for any insider explanation. (My searches haven't been helped by the existence of a film studio itself named "Working Title.")