Head gaskets on these don't really blow out. There's head oiling passage around the rear outer head bolts that's sealed with a rubber sleeve that dries out and leaks some over time or the oil seeps thru the cam chain tunnel in the center of the head and will slowly work itself to the low side of a side stand parked bike.
Until you see wet oil, clean it off and see it reappear shortly thereafter there's nothing to be concerned with.
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