I have the same problem. Because the icon is default added by 8theme it adds an extra icon when you add the product in the wishlist. Even disabling the second default icon in the YITH Wishlist is not wanted. Because the default icon added by 8theme doesn’t change from color or something to indicate the product is added to the wislist. So not adding the icon by default and let YITH Wishlist handle the icon’s should be a better solution.
You can try adding the product in the shop to see what I mean. The URL of the staging website is provided in the URL field of this post.
I understand these settings. But with these settings the Heat icon is not filled when the item is added to the whislist.
So I still think it is beter to let the Yith plugin handle the heart icon instead of the XStore theme. Or is there a beter solution?