Something with the app then. Why do you need to uninstall it to update? You can just update it from the play store, can't you?
I have a feeling that the app version s/he is using is not "from the playstore", and thus may not be working...
As I have only been asking for help and advice so far, I thought i would also contribute a bit.
I managed to find two versions of Google Camera that work well with this ROM, for people that want a few extra features.
Google Camera 2...
For first one i need logs, second one is "System battery saver" enabled :) Disable it in L Speed, and you should be done :)
I will send logs if necessary.
But i checked and all my battery saving features in L are off, including System batt...
I can confirm both apps work on my Nexus 4 (Nougat 7.1.2).
Amazing work, thank you!
Edit: I also tried the Pixel wallpaper apk and most of the wallpapers don't work; and the beach one does not have moving waves.
I would also suggest if possible...