That never occurred to me, but it’s a good point. Not enough water, no room for proper agitation.
I’ve noticed that you can pretty much give up on a company when they switch production to China.
The Chinese mindset can’t comprehend quality. At first almost all Chinese imports were crap. Then they wewre forced to offer a warranty. So what did these Chinses mfgers do? They designed (planned obsolescence) their stuff to FAIL just after the warranty expires. Especialy true in car parts. If the Chinese made water pump has 24 month warranty I can assure after month 25 you will start smelling anti freeze.