So after digging on this, we found that it's a camera bug that has been fixed in firmware update 1.7 - don't know yet when this will be out. Will keep you posted.
I have no info for the firmware update, it's work in progress.
Workaround I was given - Can you try this:
set the camera to 1080p60 so that the UI for low light is enabled and turn the feature off. Now switch to wherever resolution and frame rate you wish and low light will still be disabled. The bug seems to be the metadata is storing the old state of the UI and the app is looking at the wrong metadata field to see whether low light was active.
Unfortunately this also doesn't work. Whether if I put my cam on 1080/25 or 50p the lowlight thing is always disabled and not possible to enable.
I haven't had yet the time and motivation to do a whole reset because of all my presets, etc... And I am not sure that this helps.
Haidash, when do you think will this bug being solved?
Factory reset could help - I don't know 100% for sure since as long as you don't test it, we can't know if it helps. And yes I understand how annoying this must be for you to redo all of your presets. :(
HERO8 Firmware update - should fix this bug however I am not allowed to communicate on timing about that :( Sorry my hands are tied.