When using UE5.4 to render output, adding the ScreenPercentage command to the console panel in SkyLight HDR mode will result in a black occlusion band, which will gradually widen as the value increases. For example, if the ScreenPercentage is above 180, it will appear,
I found that as long as it is a reflective material, plus SkyLight, as the ScreenPercentage value increases, a black occlusion band will appear in the camera view. I opened version 5.1 and it was normal without this error，it is ridiculous that such a low-level error appeared in version 5.4 ，it wastes a lot of users’ time to find the cause of these low-level errors ， Do you have compensation? Why is the ability of the maintenance and development team of this engine so low? Are you trying to save money? Then who are these cheap hires? It’s really infuriating…
No technical management personnel have responded to such a bug, and UE’s technical support management personnel are quite arrogant and ridiculous 
我也一样，事实上不使用ScreenPercentage只要超过4k，skylight的反射就会丢失，造成无反射的部分像是黑色遮挡带，目前没有看到有人提出过解决方法。事实上不用lumen就可以回复反射，但会有新的问题就是反射有奇怪的竖条纹