Good question. Wet sumps are quite common in non-aerobatic aircraft. Frankly, they can do just about any maneuver for a limited period of time. Your oil control/scraper ringers ensure nothing bad happens to the cylinder. I owned a BMW and Ural motorcycle that had "Boxer" engines in them and they also had no problems, unless you laid them on their sides for more than overnight.

Hydraulic lock is no laughing matter.

Drew