I've been experiencing this problem too. It's very frustrating!
I'm currently outside with plenty of light and the 'dark filter' was applied to my snap after I had just taken a photo.
Although it's bright enough to take a photo without any extra light, I tried turning on the camera light before taking a new snap and although the camera light didn't add any light to the photo itself, it at least stopped the 'dark filter' from being applied to the photo.
Not a fix, but a temporary solution.
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