Tire chunk missing from drifting. Safe to drive?

wdkwang

I went to a empty lot and tried getting sideways for 2 hours. I inspected the tires and noticed a chunk of rubber missing from the rear left tire. The spot where the rubber missing feels like soft fur. Should I be playing it safe and drive slow or can I still drive normally? It's not a big spot and I don't feel anything while driving, but its still noticeable.

EDIT:
here's some photos





i'm confident i got these scraps on a few of my rims from tapping the cones. how can i get such bad scraps from cones? it makes no sense to me unless these rims are just soft








inner tread is mooshed together

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