Dismissing Alerts when using an "Item" binding

[ryanbooker]

This may be a raw SwiftUI question: Should setting an Alert item binding back to nil dismiss an alert?

i.e. An action occurs and the alert is set and displayed (working! :)). A second action can occur in the background, if it occurs the alert needs to vanish. However setting it back to nil doesn't do anything…

Using a bool instead works as expected…

Is this just how SwiftUI works?