Modpack: FTB Interactions 1.0.1 (On a Server)
Industrial Foregoing Version: industrialforegoing-1.12.2-1.12.10-234.jar
TeslaCoreLib Version: tesla-core-lib-1.12.2-1.0.15.jar
Crashlog (If Any):
crash-2019-04-15_17.18.47-client.txt

Tree Farm: https://minecraftguides.net/AS/constellation/tree%20beacon
X: 28 Y: 67 Z: 45 the black conveyor under the tree

Tried to reproduce it: https://gfycat.com/HarmfulSpanishIbadanmalimbe
crash-2019-04-15_17.39.59-client.txt

I've updated the modpack to the newest version and the same thing happens as well:

Modpack: FTB Interactions 1.2.1 (On a Server)
Industrial Foregoing Version: industrialforegoing-1.12.2-1.12.11-235.jar
TeslaCoreLib Version: tesla-core-lib-1.12.2-1.0.15.jar
Crashlog (If Any):
crash-2019-04-15_19.30.47-client.txt