Mod Name

Create: Crafts and Additions, Starlance

This issue occurs when only Valkyrien Skies, addons, and the mod I have specified are installed and no other mods

• I have tested this issue and it occurs with only Valkyrien Skies, addons, and the mod I have specified

Minecraft Version

1.20.x

Mod Loader

Forge

Issue description

When a ship with an accumulator made of more than one block moves to another dimension (e.g. the solar system dimension in Cosmic Horizons) the game crashes. Furthermore, when relogging, and teleporting my ship back to the ground, it had corrupted, with two chunks seemingly erased.

//aftermath of the crash

Ideally this does not occur, with the ship simply travelling to the new dimension.

I have posted this issue on both the Create: Crafts and Additions and Starlance issue trackers, too, as I am unsure as to which mod is most responsible for fixing this bug.

Issue reproduction

I initially struggled to identify the exact reason for this. After using NCME, however, it was relatively easy to identify the root cause being the accumulator, given how many times its name popped up in the crash log. I then performed some experiments, however could not reproduce it initially, as I did not realise it was for multi-block accumulators only.

//the four test vehicles, all of which caused a crash

After performing 4 test launches of the electronics of my whole rocket, gradually removing parts on each test, all 4 failed. Only once I created another, which only had the single block accumulator, did the game not crash.

STEPS FOR REPRODUCTION:

• This is relatively simple to do within Starlance, using a normal thruster on the base, and then either placing the double accumulator on top directly, or placing a chunk loader (which means I don't have to ride in the vehicle itself in order to test).
• After assembling, and powering the thruster using a lever, wait for the rocket to reach the altitude at which the dimension will transition over
• Crash!

Logs

crash-2025-09-14_12.52.22-server.txt

2025-09-14-9.log

This ideally would be fixed on crafts and additions end, but they may need some assistance from us to figure out the best fix.

Basically, when a ship is teleported across dimensions (which only starlance uses), the shipyard chunks are copied into the new dimension in the course of a tick. Certain blocks however don't like this, as they do logic every tick and briefly (while being copied) they end up doing the same operation from two different places causing a CME.