I don't know how this bug popped up but after doing a general update on the mod pack I created this issue popped up. After looking around, fiddling with the settings of the shaders, and trying older versions, I've found that the Ambersol Block is what is causing the glowing lights in the sky due do some issue or incompatibility problem with BSL shaders as when trying other shader packs this issue doesn't pop up. These lights only appear in that section of the sky and line up with the ambersol blocks when looking at them. I'm using 1.20.1.

I would use a different shader pack but BSL shaders seems to be the only shader pack that works with dynamic lighting on lanterns placed in the offhand and belt curio. Found that Complimentary Unbound works with dynamic lights and the Ambersol blocks without issue.