I had this exact problem with one of my bikes. (XR650L). They cut the bore incorrectly. Slightly oval and with too much clearance. Did you supply them with the piston to cylinder clearance from the manual ?
My piston, rings and bore were all wrecked within 20 miles. It started smoking oil and had scores just like yours.
Its now getting re-done at another place. Another £400 worth of work.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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