That's an airburst capacitor!
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Nice! Could you explain what it is or where to find more information about it? I was not able to find information online
... I'm sorry to say that was a joke, because well, capacitors like to go boom (MLCCs as in here not so much, but still).
What I do know though is that these MLCCs often dramatically change their actual capacitance with temperature, so maybe this is a sort of "temperature isolation" to keep the capacitor more stable? Honestly, no idea though.