Some multi-block structures (such as ExtremeReactors reactor structures, or RebornStorage multi-block crafter) will no longer work once some of their blocks have been un-loaded and re-loaded in a CC world. This is happening in all versions of forge and CC I have tested (from 1.10.2 to 1.12.2), and happens even if only 1 of the blocks is unloaded. The structure will no longer work until you break and re-place the blocks that have been unloaded, but not needing to break and re-place the ones that haven't been unloaded

Those may be hard to get working, but I will look into the issue.

Shouldn't this be closed and merged into #448?