I agree it is a gas bubble. To confirm this, look at the center of bubble, it is different material than what is on the rest of the coin. It also looks like a die chip above bubble.
Note no splits on that area. I agree it was a large die chip or break on the that area. Note it is taller than the devices. So the fields are showing chips (voids) on the die. Make the strike higher than the other devices.
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