Issue description:

After adding Mekanism into my modpack and loading an existing world the whole world gets corrupted; totaly unstable and laggy, most blocks have been changed into other blocks

note: newly generated worlds work fine

EDIT: https://gyazo.com/de3a82d01525b1612db7727b823e67d2 this is what happens to my world once i install mekanism

Version

Forge: 14.23.5.2772
Mekanism: 9.4.13.349
can provide complete modlist if necessary

would appreciate any help, im out of ideas

yeah, the log that message mentions? gonna need to see it.

latest.log
wasnt able to answer faster, sry ^^ took some time but finaly managed to find that damn log i guess

20:57:27] [Chunk Batcher 14/ERROR] [CodeChickenLib]: 
 CCL has caught an exception whilst rendering a block
  BlockPos:      x:-6351, y:14, z:1749
  Block Class:   class com.carpentersblocks.block.BlockCarpentersPressurePlate
  Registry Name: carpentersblocks:carpenters_pressure_plate
  Metadata:      0
  State:         carpentersblocks:carpenters_pressure_plate[facing=down]
 Tile at position
  Tile Class:    null
  Tile Id:       null
  Tile NBT:      null

Seems Carpenter's Block are your problem