vessel jumps/teleports on the surface when in time warp #4223
Description
I am on the surface of an airless minor moon in my work in progress planet mod with a radius of about 1 km, called Ubbi. A Stamp-O-Tron surface attachment point connected to a docking port is connected to the surface of the planet (similar to a launch clamp; i believe these are from Breaking Ground). However, similar behavior seemed to occur in the predecessor to this mission, which had a surface base just resting on the surface without a rigid connection to the ground. (and that's why i thought a stamp-o-tron might be a workaround)
This first video is the control, filmed without principia installed:
https://www.youtube.com/watch?v=6r_pJ2Ohp3I
When the lander launches, the docking port stays firmly connected, despite timewarp. this is the correct behavior, although with stock physics.
This second video shows what happens with Principia:
https://www.youtube.com/watch?v=5461C9jNRiM
When leaving the docking port on the surface, and then time warping, the docking port jumps up to meet the ship as if its current position was the same as the first time warp. Lateral and downward movements are worse and can result in burying the vessel underground. The workaround is to leave the physics range of the vessel (2.5km) but that is not easy to do in orbit around a 1km wide rubble pile, in which high orbits can be measured in kilometers and it would be easy to accidentally timewarp while in physics range.
I believe better timewarp is responsible for removing the timewarp altitude restrictions (unless principia is doing this), and better timewarp is definitely a must-have for the system layout i'm using, so i can't just block timewarp within 2.5 km of the surface. (Not to mention that this would be pretty annoying)
The terrain textures also seem to jump when timewarping in this manner, which is interesting.
Some other things I've observed since originally encountering this bug:
- Not a result of VesselMover. Removing VesselMover results in the same behavior. I dont have any other mods that should be affecting this.
- it definitely has nothing to do with the Stamp-O-Tron. Even with the Stamp-O-Tron destroyed, the same behavior can occur with a kerbal exiting a landed craft on the surface, only this time the ship will teleport to the kerbal such that the EVA hatch (or the center of the pod, it's hard to tell) is overlapping the Kerbal briefly. (recall also that i noticed the bug before bringing the stamp-o-tron--the stamp-o-tron was intended as a workaround)
- When moving the ship, then quicksaving and quickloading, the relative position of the ship and stamp-o-tron upon timewarp changes to be what it was when the save was loaded.
- Upon leaving the SOI of the minor moon, the ship ended up nowhere near Ubbi, like, more than 90 degrees offset. And, also, set to be landed on the surface of Gymnome.
the planet mod can be found here: https://github.com/WhirligigGirl/GoobalSlimeWorld/
the planet in particular, Ubbi, is found here: https://github.com/WhirligigGirl/GoobalSlimeWorld/blob/main/GameData/GoobalSlimeWorld/KopernicusFiles/3b_Gymnom/Ubbi.cfg
this is what my gamedata looks like:
The save file and logs are attached.
Let me know if you need anything else
glogPrincipia_2025_05_12.zip
save file 2025-05-12 principia bug default.zip