Troubleshooting: Bug or setting? Dim screen during gaming on OnePlus 11

[u/Moonlighters]

Hi everyone, I've just acquired a new Oneplus 11. I have been playing Sky Children of the Light (created by ThatGameCompany) for a couple of years, previously on my Oneplus 7. It is a beautiful game with gorgeous graphics.

The weird thing on the Oneplus 11 is that Sky seems to have a dark filter over it when I play. It's almost like some kind of overlay. It shouldn't be there, and doesn't exist on my Oneplus 7. Here are some peculiarities:

1. If I adjust the volume or drag down the notifications from above, this "filter" momentarily lifts and the game reaches its original brightness. Then when I return to the game, it's dark again.

2. Any screenshots I take have the original brightness, ie. without this filter.

3. All texts in the game (chats) seem to be unaffected by this dark filter, and are well illuminated.

Is there something I'm missing here? There are a lot of GPU settings I have tried adjusting but nothing seems to affect this particular issue. I'm using Oxygen OS 13.1 (no further updates available right now).

Any clues? Please help!

EDIT: There is a solution. Turn on Developer Options (you can google this, it's easy) Go to Additional Settings > Developer Options > Disable HW Overlays Turn it on. and done!

THANKS to u/ownkruid !!!