I can see that Combined Listings are now supported on SHOP APP (though I haven’t seen any change log entry so far for this). This used to be a limitation and was listed on https://help.shopify.com/en/manual/products/combined-listings-app but I don’t see that being mentioned anymore.
Here is an example of a merchant and PDP built using CombinedListing - https://shop.app/products/7192207982686/the-cozy-clog-cookies-and-cream-boucle?fromShop=true&variantId=41953073365086
When you click through color swatches, media gallery only refreshed the 1st image and all alternate images are now out of sync and are not related to colour you switch to. Compare this to merchant website which has correct behaviour - The Cozy Clog in Cookies and Cream Bouclé | Rothy's
I think this is a bug which should be fixed.