I think what's happening is that the hot pixels in your darks have a greater value than the hot pixels in your lights, so when the darks are subtracted, the hot pixels become 0. I zoomed in on one of your lights that showed the hot pixels and then opened the master dark and zoomed it to the same level. Blinking between the frames shows the hot pixels lining up, but when I check the value of the respective pixels. The pixel I looked at had a value of 2946 in your light and 3352 in your dark. The fits headers show your dark was exposed at the same duration and length. Did you use an offset when you took your images and was it the same for both the darks and the lights? A mismatch there could explain why your darks are matching your lights.
The problem with the instructions for CosmeticCorrection in that link is that it was only setup to remove hot pixels. You need to select a cold sigma under auto detect as well. When I did that, the resulting master light no longer had the dark streaks.
Here's the result with the right one only with hot sigma checked, and the left with both hot and cold.
Edited by Alex Ranous, 14 October 2021 - 02:51 PM.