I got this Select item in a form:
Clicking on Submit doesn’t display an error message for the Select field; it works fine for other mandatory fields. I also added a Modal element and the workflow correctly uses the false branch:
But the modal is not displayed either (might be another issue although I don’t find any reason why).
I recently had a similar issue but I couldn’t always reproduce it so I closed it:
There is also this older issue:
The Select item has a Required property in the meantime but it still doesn’t work. It only works, if I select a country, remove it
and then click Submit again:
But this is not something the user usually does. This is probably a bug.