Visibilty of components doesn't seem to work properly with async component creation

[CantuStange]

Hello,
I've encountered a problem with the visibility of components when creating and destroying other components in async events.
It seems like IntraWeb is generating duplicate style tags for components that changed styles but remained in the page and that breaks their visibility.

I attached a Delphi project that simulates the problem:

1. Press "Create components".
   
2. Press "Destroy components".
   
3. The IWtest region (below the red label) is no longer visible even though it should be.
   

The "List IW Styles" button should list the duplicate styles mentioned above.
If the page is reloaded the region appears as expected.

Am I doing something incorrect in the code or is this a bug?
If it is a bug, is there a workaround or fix in future versions of IntraWeb (I'm using IntraWeb 15.2.69)?