Set a game to portrait mode only, join it on a phone. It will load in portrait mode, switch to landscape mode when the game loads, then switch back.
Verified on iPhone XS Max.
Set a game to portrait mode only, join it on a phone. It will load in portrait mode, switch to landscape mode when the game loads, then switch back.
Verified on iPhone XS Max.
Can confirm on iPhone XR. Been happening for a little while though.
Experiencing the same on Galaxy S6, Galaxy S9+, & iPhone 7. Seems to be a device-wide issue.