SwiftUI, numeric keypad, and missing keyboard toolbar

Have a SwiftUI TextField with .numberPad keypad. Want to allow the user to make their changes, then hit 'Done' or 'Cancel' to dismiss the keyboard (there are other choices on the page) before hitting 'Submit'.

The view containing the field is brought up as a modal, using .FullScreenCover.

Here's the code snippet:

@State var currentBid: Float = 0
@FocusState var isInputActive: Bool
...
TextField("Enter Amount", text: Binding(
     get: { String(Int(currentBid)) },
     set: { currentBid = Float(Int($0) ?? 0) })
 ).keyboardType(.numberPad)
   .focused($isInputActive)
   .toolbar(content: {
        ToolbarItemGroup(placement: .keyboard, content: {
              Button("Cancel") {
                  print("CANCELLED")
                  isInputActive = false
             }
             Spacer()
             Button("Done") {
                  print("DONE")
                  isInputActive = false
             }
        })
})

When you tap the text field, the numeric keyboard comes up, but the button bar does not show. This is on iOS 17.6. tested on-device.

The alternative is to use a regular alphanumeric keyboard with an "ENTER" button. But the field is to enter a number and I have to either filter the value or discard it in case they enter bad data.

I checked online, and others indicated wrapping the whole View inside a NavigationStack might be needed. Tried it and it didn't work.

Any suggestions? Thanks!