No. This is a real problem and has nothing to do with the camera.
If I leave the app for 5 seconds while writing a comment to look something else up in Safari, for example, I have to wait for the app to launch from scratch, choose the Meta site again, find the topic again, and hope that most of my response got saved as a draft.
I assumed when this first started happening that it was related to a bug I read about in iOS 13. But that has been fixed and the problem is gone for other apps.
Edit: I’m on an iPhone XS, and don’t run into this with any other app.