Failed to load mods: Cerys-Moon-of-Fulgora/compat/visible-planets.lua:2: attempt to call global 'vp _override _planet_sprite" (a nil value)

Let us know if this API is deprecated

It's an issue in Cerys, it's trying to call it before the function is defined.

You can either call the function in data-updates.lua, or add VP as an optional dependency to force Cerys to load after VP.

Not sure why it would've broken in 2.1 though? I assume Cerys just happened to be loading first in 2.0, and that's changed for some reason.