When creating a structure Block with one wing of my Main Storage System and loaded it mirrored on the opposite site of the hallway, I realized that the Double Chests are not connected to a double Chest. Instead they are all single Chests. This only occured when the Structure was mirrored.
Environment
Windows 10, newest Java Version 30/05/2020
Thank you for your report!
However, this issue is a Duplicate of MC-134110.
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