RedirectException in onReturn is caught in returnPage()

Problem/Motivation

The RedirectException thrown when a payment is still pending is caught in a catch (\Exception $e) in returnPage() which results in not processing the redirect and redirecting to previous step.

Steps to reproduce

Make a payment that returns back to the site with pending status.

Proposed resolution

Either use RedirectResponse::send() or a while()/sleep() that waits for status change.