'Decline to Sign' does not dismiss view controller or send a cancel notification

[joel-perry]

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SDK version: 4.0.1 iOS version: 18.4

I am presenting captive signing without authentication as described here. On completion of signing, the DSMSigningCompletedNotification is made. When manually cancelling a signing, the DSMSigningCancelledNotification is made. In each case, the view controller is dismissed as expected.

When choosing 'Decline to Sign' from the captive signing session, however, the view controller displays a progress spinner indefinitely, never dismisses, and never sends the DSMSigningCancelledNotification.

Apologies if I am missing something obvious here.