This mod add a countdown to nauvis imploding, destroying Nauvis and altering the game loop. It also includes a new planet similar to a Nauvis Hellworld to acquire Nauvis resources later.
The given sprite rectangle (left_top=0x0, right_bottom=2048x2048) is outside the actual sprite size (left_top=0x0, right_bottom=512x512).
If this is being used as an icon you may need to define the icon_size property.
See the log file for more information.: nauvis-implosion/graphics/icons/starmap-planet-gehenna.png
The icon is 512x512, the same as the nauvis starmap in the same location. I wonder if you're using the HD planets mod, maybe that's what is causing it?
If it is, I'd be interested so I can properly support that case.