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Sorry to hear about your engine. Never good to see a fellow enthusiasts having engine issues.
It does look like there are witness marks in the squish band where the marks seem to line up with the marks on the piston. Year ago i seen the same thing happen (same issue different type of engine) and it ended up being a small part of the valve guide braking away and getting caught between the valve and valve seat which was enough to bend the valve slightly and then the broken piece of guide made its way into the chamber and damaged the piston/squish band on the head very similar to your pics. The only way you could tell if it is the valve guide is to remove the valves and inspect the guides. I’m not saying this is definitely the case with yours, just that it looks very similar to what i had seen happen on another engine.
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