Before I report this as a bug, I would really appreciate it if someone can tell me if I have a setting wrong. The problem does not happen in Construct 2.
Problem: on iPad or iPhone when game is saved from safari to the homescreen, when device is changed (tilted) from portrait to landscape or landscape to portrait, the viewport shrinks and full screen view is lost and there's large black margins.
Link to cp3 file: 1drv.ms/u/s!AobC4q3rBlr6wrVB2dVq8Zr6pTm6Jw
This is a simple file with the background changed to a color so you can see the viewport.
Viewport Fit: Cover
Fullscreen Mode: Scale outer