UI Toolkit - Letters go missing in Game Mode

Unity: Text (TextCore)

This issue has been closed as a duplicate of:

2023.3.X

As the Summary states - While the menu item looks fine in UI Builder, in Game mode, they go missing.

Repro steps:

download this project https://drive.google.com/file/d/1x24wcTlL5AYmqZTz_EmFn5vLf3PrleZE/view?usp=sharing
Press play - wait for 5 seconds, and notice the text on the buttons.
Going into UI Builder, notice that the buttons look correct there

Tested and reproduced in Win11 - with all versions of Unity supporting UI Toolkit.