Thank you. My issue is definitely a duplicate of that one. Not sure why my search didn't find it.

There's an argument that this isn't a bug (the ship isn't actually moving towards Vulcanus) so the Vulcanus=2 signal would be inaccurate, but I'd argue the ship is moving just with velocity=0.

What did I do? This seems like a race condition that breaks my circuit logic. I assume the ship arrived at Nauvis with zero fuel in the thrusters, so there is no thrust to start the ship moving away and update the "To" signal. A pump is programmed to only fuel the ship when velocity is below 60 and ...

Excellent, thanks!

The rocket is requesting construction robots.
I have none available in the land-based logistic network, but one in my inventory.
It repeatedly flies back and forth trying to load itself into the rocket.

Save file attached.

Screen recording: https://www.youtube.com/watch?v=ktwmjkGDnfc

Video showing the bug on a different save - https://youtu.be/VkzOtKQAqq4

I created and attached a minimum save game using Rocket Rush mode for easy setup and cheated in an infinite accumulator.

1. Load the save game, make sure it's daytime (far left light should be off).

-- The first light is ...