Hi Hayden,
Many thank for this contribution!
I am install this add-on to a fresh installed 2.3.1, have a problem in shopping cart page, top price include both product and attribute price, but sub-total only show the product price, same in right colum shopping cart box too, only display the product price. check out show the price for both product and attribute with no problem.
screenshot attached.
Many thanks for your help.
Tim