Does Asset Exist and Delete Asset no longer in 4.26?

I’ve made a widget in the preview of 4.26 which checks some assets, deletes them if necessary or creates new ones.
I tried using this widget in the latest 4.26 version and notices a lot of those Asset action nodes where no longer available. (Such as “Does Asset Exist”, 'Delete Asset", Duplicate Loaded Asset",…).

Am I missing something here?
Is there an alternative to those functions?