Hi!
Something is not working properly at autocomplete. If the User type strings to the textbox, then select a value from the dropdown with keyboard (ENTER) not with click event, then if the user clears out the textbox and want to search another item in the dropdown, then the dropdown does not show up (but if you click outside of textbox and back then it works again) in addition, there may still be minor problems with this component.
OFF topic: at https://blazor.radzen.com/mask the Credit Card's change event labda function text should be "Credit Card" not "Telephone", but this is just a small spelling 