Looks more like a dry sump pan meant for a multi stage (3-5 stage) external
oil pump.
That sump would suffer from
oil surge and so a single stage external pressure pump would be starving for
oil, and oil pressure loss to the engine is the result.
Two scavenge pumps ( 2 stages of a 3 stage pump) sending the oil from the pan to a remote dry sump tank that the pressure stage can draw from will supply a surge free oil supply to the engine.