Hi Jeremy,
We’ve seen some similar issues around defining custom navigation rules on UserWidget instances, though it’s odd that you see it in a packaged build and not in the editor. I have a feeling it’s related to load order, since anything you’ve ever opened in the editor will stay loaded. There were some fixes in CL# 40907348, could you try grabbing that to see if it helps? If that doesn’t work for you, we’ve had some luck setting the navigation rule on construct, so you could give that a try.
Best,
Cody