Should there be a sizzling noise when my truck stops?

I just bought my truck and it runs well with no
problems. But, I started to notice from the day
I bought the vehicle that after driving it for a
while then putting it in park there’s a sizzling
noise that’s happening. I brought it back to
the dealership to check it out and they
proceeded to tell me that it was normal. I’m
not comfortable at all with that sound nor
have I heard a truck do that before. Is this
something I should worry about?