I've traveled a number of times while my PR was processing to Europe and Asia. However, I did have a valid IEC visa. I was nervous at the border coming back but the officer was very chill and basically only asked me if I had a good time.
I am now on my second visa, the OWP that you can apply for with your PR and I have not traveled with that one yet. I don't plan on doing so either because I don't want to take the risk of being rejected entry so close to the end of my application.
I think if you hold a valid visa, travelling is not a problem. Just don't travel to your home country after submitting your PCC.