WordCountCodeLensVisual custom UI not appearing when custom CodeLens label is clicked

[J-Double-J]

I am trying to understand the code lens feature and one of the steps includes a sample for a custom UI that is displayed when its clicked. However, when I try to visualize the custom UI it doesn't appear to work as expected. Instead it shows an empty box.

Reproduction

1. Pull latest from VSExtensibility
2. Build Solution and run "Current Instance [Visual Studio Community 2022]"
3. Navigate to a solution
4. Click on the new CodeLens tag "Occurrences of 'return': X" that is on a method.
   a) Clicking on the popout doesn't change anything either.

Expected: A custom UI Pop Up that allows you to change the searched for word.
Actual: