Terra Palus 0.2.10 defines its 13 active ambient sounds in prototypes/ambient-sounds.lua using the obsolete singular field:
planet = "terrapalus"
Factorio replaced this with the plural planets field in 2.1.13. With PlanetsLib 2.0.8 installed, PlanetsLib repairs every definition during data loading and adds a red warning to Terra Palus's localized description. The warning then appears in planet menus and interfaces:
Ambient sounds for this planet corrected by PlanetsLib. See AmbientSoundPrototype:planets.
Reproduced with Factorio 2.1.21, Terra Palus 0.2.10, and PlanetsLib 2.0.8.
The fix is to update each active ambient-sound definition to:
planets = {"terrapalus"}
I applied that change locally to all 13 definitions. PlanetsLib correction messages disappeared from the log.
