Please be so kind as to read my full post before responding. Thank you for your consideration.
In one of my PowerApps, I want to show a Gallery of items of a custom "WelcomeApp Event Config" entity, which is linked to the default systemuser entity via a many-to-many relationship "kk_kk_welcomeapp_userconfig_systemuser", depending on the user who is logged in. I have a two other many-to-many relationships between custom entitities which don't cause any problems. Since this is a pretty recent PowerApp, the relational data feature is turned on by default. But with this particular relationship, I don't seem to be able to use the relational table as Items or for Collect. Both of them only yield an empty (?) table. CountRows works though.
What happens in my App is that with App.OnStart I have:
Please be so kind as to actually read my post. My post mentions several times, with screenshots, what that name is for. It is not a lookup field.
And you are wrong about the new relational Data tables. They are always appear as a new "fake" field in the one entity for one-to-many relationships. The many entity only carries the lookup field but no relational data field.