I've an app that uses WkWebView to play audio from Soundcloud and Mixcloud by using their javascript widget, on iOS 13 Beta 6 the audio stops when the app is not in foreground, even when Audio is on in Background Modes.When starting the playback this assertions is thrown:Error acquiring assertion: <NSError: 0x282cf67c0; domain: RBSAssertionErrorDomain; code: 2; reason: "Required client entitlement is missing"> { userInfo = { RBSAssertionAttribute = <RBSLegacyAttribute: 0x1592432e0; requestedReason: MediaPlayback; reason: MediaPlayback; flags: PreventTaskSuspend | PreventTaskThrottleDown | WantsForegroundResourcePriority>; }And after entering background state the following assertion is thrown and audio suspended:Can't end BackgroundTask: no background task exists with identifier 13 (0xd), or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug. [ProcessSuspension] Background task expired while holding WebKit ProcessAssertion (isMainThread? 1).This is not happening in iOS 12, where the audio plays normally when in background.