Immediately I apologize for my English, I use google translate.

1. Minecraft version: 1.12.2
2. Galacticraft version: 4.0.2.280
3. GalaxySpace version: 2.0.17
4. AsmodeusCore version (for 2.0.1 version and above): above 2.0.1
5. Side (Single player (SSP), Multiplayer (SMP), or SSP opened to LAN (LAN)): SMP
6. Other add-ons: IC2 (2.8.221_ex112)

Description of the issue:
My problem is that when I start the server with galaxyspace everything works fine. but when the player takes off on a rocket and crosses the border of the flight strip (the one on the left with my character's avatar), the flight goes further and the client crashes with an error server not found. After that the server stops responding to commands and crashes with the error org.spigotmc.WatchdogThread.run(WatchdogThread.java:85).
I'm using Mohist Server Core (1.12.2-307). Do not use plugins only specified mods

Screenshot/Video:

Attached log file (or url on pastebin.com):
2022-02-07-1.log

also here are my config files:
config.zip

Thanks for your help)