Oil in air filter box?

I was doing a 5th gear burnout just roasting off the old tire and it got a bit hot and leaked some coolant out... Then I noticed a small bit of oil coming out of the airbox. Opened it up and there's a bit sitting and the bottom and some on the air filter itself .

How does it get in there and is this an issue?

engine blows it out through the breather pipe, which joins into the bottom of the airbox

Overfilled with oil can cause it

Crankcase pressurization due to worn rings can cause it

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