I think with local dimming set to auto it gets enabled when a HDR signal is detected, otherwise it's off. The screenshot was the loading screen of Control which doesn't support HDR. HDR is also set to off in windows as it makes everything dull.
In a HDR supported game like FarCry new dawn the black area's are very black but the haloing is pretty bad in the areas with something on the screen
I used my Oneplus 7 pro camera in point and shoot mode. Happy to provide more pictures when I get back from work
So you've ordered 2 screens in a row that had the same backlight bleed in non HDR? If so then I'm not sure the product should be on the market.