Of the French phrase "Je Ne Sais Quoi," meaning "Something (such as an appealing quality) that cannot be adequately described or expressed," JNSQ seeks to be a finely crafted and freshly challenging planet pack. "Galileo's Planet Pack (GPP)" as many have come to know, has broken many conventions and raised the bar very high for high-quality, challenging, career-friendly, and long-term thrilling planet packs. But now it is regarded as only a stepping stone next to this.
On further investigation prompted by what you wrote, it looks like Scatterer's sunflare is broken for me, with or without "JNSQNoGhosts". Unity sunflare mode seems to work okay. Deleting ModuleManage.ConfigCache did not make a noticeable difference.
Note that when set to Scatterer mode, I sometimes see a fraction of a second of flare as a ship loads before it gets replaced by an unflared sun. I'm a Scatterer novice, but maybe Scatterer is starting and quickly stopping, or maybe Unity mode a