Macbook Pro M2 - Faint nail-polish remover smell coming from the left exhaust

There's a very faint nail polish remover smell coming from the left exhaust of my Macbook Pro M2.

The internet says it could be a failing battery or some battery puncture, but I don't see signs of a swollen battery.

I will book go to an Apple Store in a few days, but in the meantime, I wondered if anyone could offer any insight.

Thanks in advance.