Issue description: See title. Crash report is result of reproducing on physical server; on physical client, the game simply freezes.

Steps to reproduce:
-Set up an area of space using the space controller blocks and attach it to a space card as normal.
-Make sure the area of the space has blocks inside of it
-Place a Builder in front of the Space Controller Block so that the area the builder will write to contains the SCB
-Power the builder, install the space card, give it a redstone current, and change the mode to "swap"
-Run the builder

Versions:

• Minecraft: 1.12.2
• Forge: 14.23.5.2811
• CompatLayer (only if on Minecraft 1.10 or 1.11): N/A
• McJtyLib: 1.12-3.1.1
• RFTools: 1.12-7.60

Possibly incompatible mods and versions:
Plugin (NotEnoughIDs-1.5.4.3.jar)
TransformerLoader (OpenComputers-MC1.12.2-1.7.4.153.jar)
ForgelinPlugin (Forgelin-1.8.2.jar)
RandomPatches (randompatches-1.12.2-1.13.0.1.jar)
CTMCorePlugin (CTM-MC1.12.2-0.3.3.22.jar)
BIFLoader (BowInfinityFix-1.11.x-1.12.x-rv5.jar)
SoundUnpack (OpenSecurity-MC1.12.2-1.0-18.jar)
MalisisCorePlugin (malisiscore-1.12.2-6.4.0.jar)
Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
ShetiPhian-ASM (ShetiPhian-ASM-1.12.0.jar)
HCASM (HammerCore-1.12.2-2.0.4.2.jar)
IELoadingPlugin (ImmersiveEngineering-core-0.12-88.jar)
AstralCore (astralsorcery-1.12.2-1.10.11.jar)
EnderCorePlugin (EnderCore-1.12.2-0.5.45.jar)
EECore (ExpandedEquivalence-1.12.2-11b.jar)
OpenModsCorePlugin (OpenModsLib-1.12.2-0.12.1.jar)

Relevant logs, if any:

Big boy crash report: https://pastebin.com/Ya3xSDZg

Bug reproduced with clean instance containing only RFTools and McJtyLib.

Crash report: https://pastebin.com/TjQfCJjK