Blocks don't appear when blocks are clone back to original position

Put the summary of the bug you're having here
Blocks don't appear when blocks are clone back to original position
What I expected to happen was...:
trigger the clone command and it clone to different location, modify it then clone it back with the added blocks

What actually happened was...:
When i used a clone command to clone a set of blocks to a different location, then added a block to the set then cloned the "modified" set back to the original location.

Steps to Reproduce:
1. make a structure,
2. Take the structures coordinates (X,y,z and x.y.z)
3. Put cords. in a clone command and initiate clone to different location
4. Once cloned to other location, modify the cloned area with blocks
5. clone back to original location.

Attachment Information:
This is a map I'm working on, if you click the sign n the closed building, modify it then clone it back, it won't appear.
It one crashed my game