Have you noticed that when you create a separate feed for Shopping Actions that at the same time the same products listed in the shopping ads disappear from your Graph? Well, that is rather annoying and as I have experienced this is the expected behavior of Google Merchant Center and confirmed by the Merchant Center tech team.
There are two ways you can move forward.
Change the product ID’s so that these are not the same as the shopping ads feed product id’s.
Instead of submitting your shopping actions products in a new feed, use the same feed from the shopping ads. You can do this by going to Products > Feeds > click on your feed > settings > edit your target country and check the box next to shopping actions and save.