It is a well known Bf109 bug.
The rear tank explodes too easily (it had armored plating AFAIK) and when it does, it makes nice fireball but no damage.
The only thing it does is to make the plane lose most of its fuel (as pilot, you see the sudden drop in available fuel). If you were flying low on fuel, after the explosion, your engine will stop, out of fuel...).
~S~
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