Rocket silos placed with robots do not seem to be able to change their rocket recipe.

Are you using any mods that change how rocket recipes work?

quite alot of planet mods.

Maybe age of production but i do not think so...

Ah then this is probably caused by a planet mod that does not make use of the PlanetLib library for custom rocket part logic. What planet mods are you using?

(Btw yeah age of production is probably not the cause)

Almost all of the forge ones but let me look up which ones change the rocket recipe
Muluna
lignumis (adds a prodisional rocket thing)
Pelagos (adds diseldragon so another rocketport(and a normal one))
Igrys
Hyarion
Rubia
Maraxis
Corrundum
Rabbasca
Metal and Stars

Most of those should use PlanetLib right?
i have more planet mods but those do not add rocket parts.

By the way, this seems to be fixed? don't know what fixed it? hope i does not return.

Oh I hadn't gotten around to doing anything yet. I think one of those mods got updated to use PlanetLib maybe idk? Well, glad its fixed now :D