I am currently using Multicurrencyalizer 3.81 on my Squarespace webstore www.filmfrogmedia.com
Sale items show the sale price, but not the crossed out full price.
Furthermore, the sale price in the native currency (CAD) get altered by a penny.
For example, for product https://www.filmfrogmedia.com/shop/p/mdr3-sidecheeseplate
It seems that as the page is loading, the price field on a product page is showing both the sale price and full price conjoined (ie, 40.0055.00) where 40.00 CAD is the sale price and 55.00 CAD is the full price, and the 40.0055.00 price gets parsed as 40.01 CAD. As the page fully loads, the the 55.00 CAD which should show striked out disappears, only showing 40.01.