English is not my native language.

Describe the bug

When it is placed, crash sometimes happens. Not 100%. I guess maybe my server is too potato or my version is out-date. I will try latest version later.
If it fixed, please close this issue.

To Reproduce

The first time, I place it as a new CPU in my network, and server not responding. And crash happend.
After first crash, it can be placed normally.
The second time, I place it on a Crafting Processing Unit include a 64k and a Crafting Co-Processing Unit. And crash happend again.
The third time, load back file and place again. and crash happend again.
Expected behavior

Work as normal

Additional context

https://pastebin.com/vmpYBPGn (first)
https://pastebin.com/Kb6ya3HR (third, same as the second time)
It shows: java.lang.IllegalStateException: appeng.me.cluster.implementations.CraftingCPUCluster@27b2f5d4 does not contain any kind of blocks, which were destroyed.
But I don't know what it means.

Environment

• Minecraft Version: 1.12.2
• AE2 Version: rv6-stable-7-extended_life-v49u
• Forge Version:14.23.5.2860