What "type of content to use for a Repeating group with external API

I have a repeating group that I has some text that is dynamically inserted. The editor for it looks like this.

Screenshot from 2020-09-25 09-25-27

As you can see I use the “Get data from an external API” option. When this text is outside the repeating group, I’ve checked and the correct data displays. However when I use the same element inside a repeating group, the text doesn’t display at all. The editor for the repeating group looks like this.
Screenshot from 2020-09-25 09-24-53

Any ideas on why the text element is not displaying when I put it into the repeating group?

Edit: It seems to be a more general problem. I made another repeating group like this:
Screenshot from 2020-09-25 09-24-53

and added a text element that looks like this
Screenshot from 2020-09-25 09-57-09

and this also doesn’t display. Do I absoluetly need to set values for “Type of Content” and “Data Source” in the repeating group?

Found a solution! Set a random Data Source for the repeating group