pancakeswap swapExactTokensForETH how to transfer wbnb to bnb

Question

I use contract function swapExactTokensForETHto swap some tokens to bnb, but the result is I only got wbnb instead of bnb.

I look up the transaction in the browser, and I found the difference between my code and pancakeswap:

Here is what my code did:

Here is what pancakeswap did:

How to fix my code to transfer wbnb to bnb?