Saturn’s rings steal the show in new image from Webb telescope

My guess would be that the 'gap' in the rings is just not getting any sunlight due to being behind Saturn. Remember that the sun will be at a different angle to Saturn than the JWST.

https://www.jpl.nasa.gov/images/pia00335-full-disk-color-ima...

rendering bug. expected to be patched in the next driver update.

Looks like shadow.

That's called a shadow.