Minecraft: 1.18
multiconnect: 1.5.2
Server version: 1.12.2 - 1.14.4 (I join from 1.14.4)
Mods:

• Lazydfu(0.1.2)
• multiconnect(1.5.2)
• sodium(0.4.0-alpha-5+build.9)
  Mini logs
  I see chunks or blocks from previous world (On screenshot i see blocks from server lobby)
  
  How it should really be:
  

This is unlikely to occur after the rewrite. Please reply if it does.