I found the same failure on my Huffy's drive-side fixed cup after only a few rides.

The bearings would develop play after each ride, though in part due to the bearing surfaces all yielding to the pressure of the rolling balls. This within two weeks of purchase!

I ended up replacing the suspension fork and half of the remaining components. Original cranks, levers, headset, bars, and front derailer are the sole remaining survivors, with the brakes being among the worst components needing immediate replacement due to pulsing rotors and deafening screechiness.

Before:


After: