This happens when the rocket silos are underneath each other and the bottom rocket launches before the top one but the top one is also launching. Of course it's nothing game breaking, but it would make the screenshots taken at these moments look more visually appealing.
The timing for this has to be quite specific but I managed to recreate it in editor and got these two screenshots:
[2.0.73] Rocket tip appears through the rocket in front
[2.0.73] Rocket tip appears through the rocket in front
My mods: Alcoholiotorio, More Hearts, Remove WDM Menu, Rainbow Menu Logos
Have some questions or want to chat? Join my discord
Have some questions or want to chat? Join my discord

