Save Password dialogue not triggered in wkWebView

The Save Password / KeyChain dialogue is not presented upon entry of credentials in a wkWebView authorization view. While the domain is properly entitled and the KeyChain auto-fill does appear to FILL credentials that may already exist from Safari, the save user/password dialogue never displays on a change or if no prior credentials exist in Safari. Is this expected behavior? Clearly the entitlement of the domain allows the auto-fill to function properly.