See 6 O'clock position on this wheel bearing race (right term?)

https://www.brickboard.com/IMAGELIB/volvopic.htm?js_link=1&id=13385

1988 Volvo 240 DL with about 300k and poor maintenance history. I repacked my wheel bearings less than 1k miles ago and did not see any damage on the wheel bearing race, but I may not have really looked at it. However, I've been hearing a slight rumbling.

On removing the driver's front hub, I noticed gouging at the 6 O'clock position, as shown this photo. I can feel the rough edges on the gouging when I move my finger across it.

The inner and outer bearings have no blemishes, but the inner bearing was seized on the axle.

I have a spare hub that I will install. Although I don't see any damage to the wheel bearings that were on the damaged hub, out of abundance of caution, I'm not going to reuse them.

The only unusual event that happened within the past 1k was my hitting a curb at about 5 mph on that front driver's side, but the car has been fine since then and I didn't see any damage to the tire or suspension.

What caused this gouge?

Are the solid ring-type bearings tapered or pressed in?

Thanks