Don't own a cremina, but pavoni levers have the same "issue"

Which I now see as a "advantageous feature"!
Get used to moving your thumb over the edge of the basket before hitting the knockbox, to keep it in the PF. Seems weird at first but becomes a habit fast. I've been doing it this way for 6 months and have yet to burn my thumb.
I'm now in the habit of knocking the puck out this way, then rinsing the basket out under cold water and towel drying quickly in between shots. A clean, cool & dry basket creates a better seal with the coffee puck, as opposed to a hot wet dirty basket. I also find this set up stays much cleaner than the press-fit baskets I was used to with pump-driven machines.