Hope it is not the same issue as the GT3 cars.
From the article:
New Porsche 991 GT3 RS Engine Catches Fire For The Second Time, Apparently this Porsche 991 GT3 RS had a engine change after 480km (300 miles) and the second engine ended with catching fire also.
Photos and article - New Porsche 991 GT3 RS Engine Catches Fire For The Second Time
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