@PrakashP6773 

Could you please share the SR number here?

@PrakashP6773  We ran into the same issue in one of our flows.  To resolve the issue we created a custom HTML section, copied the top half of the ActionAutoSubmit and made some minor tweaks, after doing this we have something that will auto submit but will not leave a lasting onLoad function.  

here is the code we are using:   

<SCRIPT>
  <% ClipboardPage actionPage = pega.getUIEngine().getUIActionPage("finishAssignment"); 
  pega.getUIEngine().getUIAction(actionPage).register(); %>
    /*Setting a timeout to submit page automatically so the function is done onload without updating the onload event in the window*/
setTimeout(function(){
    doSubmit();
    pega.u.d.detachOnload(doActionAutoSubmit);  
},500);
</SCRIPT>

hopefully this helps.