A Wizard's Staff Has A Knob On The End - but not a lot else.
A close look at one of my $5 Blue Triangles seems to show a printing artefact, with the lower part of the wizard's staff seemingly missing.
A close up photo shows this a bit clearer.
regular stamp missing staff
This is definitely NOT a new Sport. You can still see the shadow of where the staff would have been. It is possibly caused by the scaling down of the image to fit onto the stamp sheet for the digital printing, and that it shows on this stamp simply because it affects a feature that is easily recognisable. Whether this is a consistent finding for a particular stamp on the sheet may be almost impossible to discover, so it should be classified as interesting, but not worth cataloguing.