Adding .id(UUID()) to my NavigationLink (inside a NavigationStack) worked for me. I would love to know the reason behind this issue and will be watching for a solution. I am on iOS 18.2 but had no problems on iOS 17.5.

I've found that the get and set closures for Binding seem to help with optional values. Below, the Binding for the username property uses the nil-coalescing operator (??) to provide an empty string as a default value when tempUser.username is nil. The set block handles setting the tempUser.username property, ensuring it becomes nil if the new value is an empty string. private var username: Binding<String> { Binding( get: { self.tempUser.username ?? "" }, set: { newName in self.tempUser.username = newName.isEmpty ? nil : newName } ) }