When playing in third person view mode while in any vehicle, the camera will start to shake and glitch out. This only appears to happen when both Flan's Mod and Galacticraft is installed. After removing Galacticraft, the camera returns to normal. I took screenshots of the glitch but the issue cannot be seen in the images.

Tested with:
Flan's Mod 4.7.0
All of Flan's content packs for 4.7.0
Galacticraft (Galacticraft Planets, Micdoodle Core) 3.0.2.199
Forge 10.13.1.1217

If you need any more information or would like me to move this issue to Galacticraft, then please let me know!

This sounds like it is most likely a Galacticraft bug. My third person render distance override and custom camera are only overriden when in a vehicle and for the tick immediately after you exit the vehicle. It seems like Galacticraft is being careless and overriding these the whole time, rather than just when in a spaceship, so that the two mods battle it out when in a vehicle and cause the bugs

Alright, thanks Flan! I'll let Galacticraft know.

Hi, I'm co-developer of Galacticraft with micdoodle8. We are happy to co-operate in trying to fix this issue. @jamioflan please can you help by pointing me to which of your code activates and de-activates the custom camera and view distance override?

(Note: Galacticraft does not override view distance or camera when a player is not in a rocket, but we have various eventhandlers and bytecode hooks which will take effect when a player is in a rocket or a couple of other situations which would be in space dimensions only.)

Hi again, we think we fixed this in Galacticraft 3.0.3.200. We'd coded in a reversion to the normal camera zoom any time the player was not in a Galacticraft vehicle, now limited to the tick when the player actually exits the Galacticraft vehicle.