When PlanetsLib is enabled, the mod turns crazy:
1. the recipe for building the rocket in the silo appears as "recipe not researched".
2. the recipe for building the rocket in the silo has a different icon.

When PlanetsLib is DISABLED, everything works as normal, even the external rockets part compatibility.

Also, looking inside the code, its pretty convoluted ...

Thanks for your report. Did you test with planetslib only? Or were there also other mods involved.

In the past I did extensive testing with planetslib, external rocket fuel and liquid rocket fuel. But I did not test with actual planet mods which require planetslib.

Also I noticed that sometimes it can help to rebuild your silo if you changed /added relevant mods.

Yeah, tested with only:
- space age
- planetslib
- external rocket parts
- recycled cargo pods

Made a fresh sandbox game (for testing), and just placed a silo, the top of the GUI says "recipe not researched", and the problems still appear.

Ah yes, thank you for reporting. This should now be fixed in the latest release.

Thx, now works as spected.

However, I encountered a little bug: If the silo already had some progress, once ur mod gets added to the game, it says "output full" at the top of the silo GUI. This seems more like a Factorio bug itself, instead of this mod. Making sure the silo has 0% progress (before adding the mod) solves this.