Description of the issue:

Created a new world, explored for a little bit, saved and exit to main menu, went to load the world immediately again (without restarting game), and the game freezes.

Crashlog:

Hastebin

Versions & Modlist

Minecraft: 1.12.2
Immersive Engineering: 0.12-83
Immersive Petroleum: 1.12.2-1.1.9
Immersive Tech: 1.12-1.3.10
Just Enough Items: 1.12.2-4.11.0.202
Just Enough Petroleum: 0.1

Yeah, known issue. I'll try to get it fixed today or tomorrow.