Update November 13, 7:20AM UTC: Facebook has confirmed the issue, calling it a bug (who would’ve guessed, right?).
“We recently discovered our iOS app incorrectly launched in landscape. In fixing that last week in v246 we inadvertently introduced a bug where the app partially navigates to the camera screen when a photo is tapped,” Facebook VP of Integrity Guy Rosen tweeted. “We have no evidence of photos/videos uploaded due to this.”
Ага, баг это, конечно 😂