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Overboosted means what exactly? What boost are you running? Looks like that plug is running extremely lean. Video appears to show you have melted a head or cylinder top region where the mating surface is. Likely ring lands on that piston are damaged too. We've seen this many times sadly when folks turn the boost up, on pump gas , without adequate fueling mod's and ignition changes to suit, dyno testing etc, to go with the added boost on these aircooled engines.
Disconnect the coil wire and crank it and most likely you'll have very uneven cranking from a dead cylinder(no compression) . You'll need all the plugs back in. Also do a leakdown or compression check on that cylinder(and others -several may be wounded).
Sorry to share likely bad news.
Kevin
GAS Motorsport
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Upland, CA
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