On my survival world, I had a fully fueled Tier 1 Rocket and 56 storage spaces, all taken up. Before launching to the moon, I copied the world. I came back to the same world, and the rocket was gone. Mods installed:
Galacticraft Core 1.7-3.0.12.463
Galacticraft Planets 1.7-3.0.12.463
Micdoodle...