Wild guess: Try disabling "Export Rare Materials" for the rocket.
A drone with an ongoing delivery for the rocket might be stuck somewhere.
If that doesn't help, I'd recommend filing a bug report (with the save and ideally a save before the glitch happened) in the related forum.
A drone with an ongoing delivery for the rocket might be stuck somewhere.
If that doesn't help, I'd recommend filing a bug report (with the save and ideally a save before the glitch happened) in the related forum.