that is not normal. something scratched the piston. the scratch seems goes thru all the way to the top thru 2 rings. you may try to see if the idle is stable in your upcoming run in.

i will warm up the engine with your temperature, and "make sure" the chassis has shared the same temp before i put it on track to "run in" and prevent the engine stopped without fuel. i will refuel, say 3 mins or some laps.