Shipping method form resets selecting "Shipping same as billing address"

Basicly i’m having the same problem as described here: link

What steps will reproduce the problem?
1.Enable “Shipping same as billing address”
2.Enable and config two or more shipping methods
3.Go to checkout page with at least one product in the basket
4.Select one of the shipping methods but NOT the first one (the one on the top of the list)
4.Fill out the billing form and then click in “Shipping same as billing address”
5. Scroll up and you will see that the method you selected is now unchecked and the first one it is selected instead.

What is the expected output? What do you see instead?
I expected the shipping method not to be changed.

Since the topic and solution from above link is 2 years old, I suspect applying it would brake the functionality of the current ver.

Plugin version 3.8.9.5 – any ideas? 🙂

http://wordpress.org/extend/plugins/wp-e-commerce/