Hi,

At first it would be great if we could check your WBS setup. Could you gather the following details?

Thank you.

I don’t see anything wrong with the setup. It should be working as expected. And it works on a test server. If you have an idea of how to reproduce the issue on the test server let me know. Feel free to change anything there.

As of your site, there might be something preventing WBS options from appearing on the cart page. Please try disabling all other plugins and switch to a default theme temporarily. If after that the WBS shipping option appears, return things back one by one until you notice the issue is here again. Make sure to reset WooCommerce shipping cache on each test, for example, by adding or removing an item from the cart.

It would also be helpful to add a WBS rule activating for all orders and showing total order weight as the shipping option price:
— Weight Rate: charge 1 per each 0g over 0g; (keep everything else in its default state).

Great.

After a check, it appears that WPC Product Bundles, internally, in the cart, replaces discounted items with a virtual item having a negative price. WBS expects a cart price to be zero or more, so it doesn’t activate any rule in another case.

We’ll think about a possible way to handle that better without a chance to break existing installations. No ETA, though.