When the height of the popup is set to 'auto' and it opens upwards, the resizing process causes it to be incorrectly positioned.
1. Open this REPL - https://blazorrepl.telerik.com/mHuoPRFk52ienlUt52
2. Shrink the browser so that the ComboBox remains at the bottom of the window:
3. Type "item 2" in the ComboBox