New camera, no flash, no torch light

I’m having the same issue with the stock camera app of the LineageOS ROM by @snevas

I’m having a brand new Fairphone 2 with both recent camera modules (12 MP and 5 MP).
Sadly I didn’t test the flash with the stock ROM before installing LineageOS. But I guess it’s a problem with the AOSP standard camera app, which is the default in LineageOS and probably in “Fairphone Open OS” too.

WORKAROUND:
Use Google Camera app. (or maybe some other camera app)