Data explorer fails to insert links

[jquesada2016]

Given the following schema:

module default {  
  type Test {
    required a: A;
    required b: B;
  }
  
  type A {
    required a: str;
  }
  type B {
    required b: str;
  }
}

Do the following:

1. Go to the data explorer
2. Go to default::Test table
3. Click on insert Test button
4. Click on the a column to go to the default::A table
5. Click on insert A button
6. Add a string for the a column.
7. Click on the back button to go back to Test
8. Repeat steps 4 - 6 for the b column
9. Click on review changes
10. Click on commit

After following these steps, you should see the foollowing error:

On a related but different note, I am a user who is legally blind, and it was very difficult to get this data, because the UI does not allow selections with the mouse cursor, which makes it hard to focus on with the screen reader. Otherwise, I would have copied the text here, rather than taking a screenshot. I'll open separate issues for the issues I ran into trying to navigate around.

I also tested on 5.7 as well as 6.0.0-beta.1