Burn-in LG G6

To add a bit of context, they are pictures taken after the still image has been on screen for a period of time. ABL detects the still image and reduces the brightness every few seconds. The 2017 panels reduce the brightness at a slower rate I believe. 

ABL is supposed to stop burn in issues like the one here. You need to go back to LG (or JL) and say you haven't disabled any of the burn in prevention measures (ABL, screen shift) and don't push brightness to the max so they can't claim miss use. 

ABL doesn't just apply to still images - it applies to the brightness of any image irrespective of whether it is moving or not. It has to do this to keep control of peak power consumption.

ABL will kick in immediately if the image is bright enough - but it is true that it may become more aggressive after a period of time.

Here are the figures for how a C7 limits peak brightness from RTings:
HDR Real Scene Peak Brightness 600 cd/m2
HDR Peak 2% Window : 699 cd/m2
HDR Peak 10% Window : 681 cd/m2
HDR Peak 25% Window : 435 cd/m2
HDR Peak 50% Window : 240 cd/m2
HDR Peak 100% Window : 146 cd/m2
HDR Sustained 2% Window : 653 cd/m2
HDR Sustained 10% Window : 649 cd/m2
HDR Sustained 25% Window : 429 cd/m2
HDR Sustained 50% Window : 237 cd/m2
HDR Sustained 100% Window : 145 cd/m2

The tests above are done using a white square on a black background. As that white square gets larger the average level of brightness of the total screen goes up. On this LG it looks like ABL really kicks in somewhere between 10% and 25%. 

I have also never heard of ABL being described as intended to reduce screen burn as it would not have much impact on screen burn. Screen burn is much more likely to be caused by small, bright areas of the screen remaining static such as a bright logo. Such a logo is unlikely to be affected by ABL as it is small. As can be seen above, this LG will happily display a bright white square that covered up to 10% of the screen at pretty much full brightness indefinitely.