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Both issues have been resolved.
Regarding the water, I was an idiot. To quickly survey the map, I placed a cartographer's house near the starting point, which, as it turned out, only reveals land. All the water remained covered in the fog of war, which I initially didn't recognize.
The lights are much more interesting. It turns out they are caused by ordinary stones called hellpike 2x2.5. I don't know why, but I'll have to go through the entire map and replace them with something else.
Nevertheless, some effects are not displayed on the map, for example, Glow - the reflection of lava. It's a pretty beautiful effect.
Moreover, the fog effect doesn't work, which caused me great sadness, as this effect is literally necessary for me in the Dead Forest location and in another one.
Very bad.
Added after 3 hours and 34 minutes
By the way, can you suggest if there's anything that can be done about the fog?