Hey there 
For bugs, the best way is to create a bug ticket here.
For issues or things that look like a bug but you’re unsure, I’d recommend chatting with support directly:
All your “old” / existing data settings are in the Interface tab:
We didn’t migrate anything to the “Data & API” tab because we didn’t want to impose the change on you and risk breaking production apps.
Sharing an excerpt from another thread to try to make things a bit clearer:
Does that help?