Woocommerce Add to Cart URL Stopped Working

After installing and using this plugin to redirect individual products after checkout, the add to cart url extension that I used before no longer works. I was creating a button linking to as an example, https://example.com/?add-to-cart=1220, to add products to the cart and go to the cart directly. These were working and now they bring you to the home page instead of the cart.

Can you please let me know if there is a fix to this?

Thank you,
Jules