Cant rotate in image viewer

If I tap a wide aspect image, and rotate my phone to enbigify my view, the image doesn’t rotate with my phone orientation. If I escape the image viewer and then rotate my phone, the whole UI rotates. If I tap an image while in landscape, the image viewer opens it in portrait mode!

Ami experiencing a bug, or is this expected behavior?

I feel like this has got to be just me - at least one other person would be complaining about this, if it were a thing, right?