Dictionary Renderer Text Background (Callout) not shown in Runtime, but is shown in ArcGIS Pro

[imbachb]

We're using ArcGIS Maps SDK for Qt v200.6.0  and we're rendering symbols using a dictionary renderer and a .stylx file.

For a specific symbol we'd like to add a background to a text. In ArcGIS pro we edited the stylx file's symbol to look  like this:

For this we defined a "background" callout on the Text Symbol like this:

However, when we then render the symbol using ArcGIS Maps SDK for Qt v200.6.0 only the text is rendered without the red background. 
Is a background callout not supported in ArcGIS Maps SDK for Qt? Is there a workaround that works with varying text lengths?

[imbachb]

@PreetiMaske, @bnoble0110Any input would be greatly appreciated, thank you.

In the meantime we have updated to ArcGIS Maps SDK for Qt v200.8.1 and Text Symbol callouts are still not rendered.

Is there a workaround? We'd like to display a dynamically sized background or border for text symbols.