I am attempting to create a web app that references an existing ArcGIS Online map containing layers from a secured service. This functionality works fine in Web AppBuilder, but for some reason whenever I try to select the map as a data source in Experience Builder I just get the "loading" icon looping for infinity, never throwing an error or selecting the data. Selecting other maps from my content without secured service references seems to work fine.
Is this just a limitation of Experience Builder going forward, or are there any plans to enable this?

Image of "loading" icon that loops