In build 2025.31500, when adding an Extension via the Component Editor, pressing and holding the Add button to access the “Standard” vs “Empty” options immediately creates the extension using the Standard template - before you make a selection from the dropdown.
As a result, it’s currently impossible to select Empty.
We’ll look into this. Just a note, please uninstall 31500 and get out hotfixed 2025.31550. Very sorry about that but some nasty bugs snuck through on day1!