Is this a air bubble?

I’ve done some research on whether this is a air bubble or some kind of error or anything but not sure. I’ve seen pics of coins in house fires and tried myself with a normal half dollar and a torch lighter and neither look the same. The pictures kind of suck but the back has a b-b shaped bubble and the front looks like a air pocket. Anybody have any thoughts?

 

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That is definitely heat damage. Clad layer raised up from the Copper core.

Not a Mint Error.

 

You shouldn't play with fire. You could burn your place down!