Ejected shells vs pusher props

Maybe it should be in the "What If" section considering how rare pushers were, idk... But SAAB J21 had 20mm + 13.2mm nose guns, DO 335 had 15mm/20mm in the nose plus a really big high velocity 30mm firing really big shells. Then there's also prototypes like SO 8000 (6 x 20mm) etc. All of which should be sucking empties right into prop.

Was this ever a problem, and if, then what solutions did it have?

They had to retain the links and cases in an internal bin.

Eng

I hazily remember a forum discussion somewhere (might be even here, it was a long time ago), about something with 20mm(?) in wing roots, that had ejection chutes going diagonally through wings so the crap exited outside of propeller arc (might have been outside of tail booms). Using the pressure differential above/below wing to generate the airflow in chutes, with chute doors being operated by guns recoiling on their mountings.

Does anyone else here remember what it was, or am I just going retarded?