Issue Description:

Crashing when trying to build an elevator.

What happens:

When trying to build an elevator, I add the elevator blocks and right-click one corner but when shift-clicking the other corner, it crashes.

What you expected to happen:

Make the elevator and assign it.

Steps to reproduce:

1. Download Thuts core and Thuts tech (newest 1.12.2 versions)
2. Get the elevator blocks and remote control.
3. Make a 3x3 elevator and right-click one corner and shift right click the other corner.
   ...

Affected Versions (Do not use "latest"): Replace with a list of all mods you have in.

• Thuttech: 6.0.16
• Thutcore: 5.21.0
• Minecraft: 1.12.2
• Forge: 14.23.5.2854
  crash-2021-03-12_21.17.33-client.txt

turns out using the version before the most recent works.