Normal. To quote from a PHOTRIO posting by “Trask” ...
“I've got a number of LTM cameras (Canon P, L1, 7s, Leica III), and a couple of 50mm lenses (Summarit, Elmar). While I can use the collapsible Elmar on the Leica and collapse it when not in use, I can't collapse the lens on the Canons because the collapsing mount hits internal baffles inside the camera.”
... which says it very succinctly. (My Elmar 50/3.5 can, with extreme care, wiggle past the baffles in my Canon P.
A good solution is to wrap a thick rubberband, or a ring of plastic tape, around the lens barrel to prevent the lens from retracting far enough to hit the baffles.