Hello, I'm trying to build an app that lists sales opportunities from Dynamics 365 in a browser gallery with the deprecated connector. However I'm getting weird results:

This how the app looks like when it's automatically build by Power App Studio. Some fields seems to work and others (foreign keys) don't. Is this because of the deprecated connector or there is another problem here I can work on ?
I've read somewhere that the new recommended way to build power apps for Dynamics is to use the common data services. Is this possible to migrate on this easily ?
Thanks in advance for your answers.