Issue steps:

• Create world by using cmd(which was provided by mohist) /worlds create test
• then select the normal type(tips: plz note that the world pending to create is a vanilla world type by using this cmd)
• then vanilla type world test was created and loaded
• (Tips: If I tp to the world now, before a server restart, the server won't crash)
• then stop and restart the server
• then tp by using /worlds tp test
• then server goes crash.

log

The crash report is this
and the console output while crashing is this

Env:

MC version 1.20.1
Server type: Mohist 1.20.1 B525
Forge version: 47.2.20
TFC version: 3.1.6

We do not support the use of custom server software (i.e. Mohist) as it has caused issues in the past. You can try reporting this to them.