This is how I resolved it:
1. Create a new screen Action OnDoneNotifyAction
2. Cut and Paste Everything from Your Preparation to your newly created OnDoneNotifyAction Action
3. Create a new isLoading variable (Boolean , with True Default Value)
4. Add a 'Loading' placehlder (eg any icon or text that reflects something is Loading on your page) . I used a Loading .gif Image below (Fig.2)
5. Add a "FakeNotifyWidget' to the 'Loading' Icon (Fig.1)
Fig.1
6. Encapsulate the Loading' icon in an if Statement with the Loading Icon in True section and the rest of the form content in the False as shown below (Fig.2).
Fig.2
7. Label the If Statement (eg ifIsLoading) Fig.3 so that you can refresh it at the end of OnDoneNotifyAction
Fig.3
Fig.4
8. Finally Assign False to the isWait variable and the Refresh the ifIsLoading (Fig.4)
9. Add a 'RunJavascript' to your now empty Preparation (Fig.5)
Fig.5
10. Finally, on Preparation Add the following Javascript Code to the Script (Fig.6):
Fig.6
"OsNotifyWidget('" + OnDoneBlock.Id + "', 'randomtext');"
Fig.6
Try this it worked fine for me!