It appears that portraitUpsideDown orientation is no longer supported on the iPhone X (both xcode simulator as well as hardware) . It still works on all of my other Apple devices.
Attached is a sample project to see what I mean. Everything is fine and redraws in each orientation until I get to portraitUpsideDown and then it seems to stay in whatever the last orientation was.
This appears to be a conscious decision by Apple according to this on the Apple developer forums:
https://forums.developer.apple.com/thread/87165
I hadn’t seen anything about it in the Corona forums so I thought I’d mention it since it was a gotcha when I tried to update my existing Corona apps for iPhone X.