Found the closed Bug #136 where chests duplicate using Thermal wrenches. This issue is still happening with EnderIO's Yeta wrench, Supplementaries' wrench, and, as far as I can tell, EVERY OTHER WRENCH that rotates generic blocks.

It also duplicates simply by using /setblock and changing the facing= parameter, though you have to add the tags manually in the command to keep the original chest's properties, of course.

Forge mod loader was used. I won't speak for the Fabric mod version, but if it happens with vanilla commands, then most likely Fabric is affected also.

Some (hopefully) helpful info:

• Mod version: 5.1.2-1.20.1
• Java version: 18.0.1.1, Oracle Corporation
• Forge version: 47.2.19
• OS: Ubuntu Linux 22.04 LTS
• Minecraft version 1.20.1

To reproduce:

1. Make a chest from this mod.
2. Place it in the world.
3. Either:
   A) make a wrench that rotates vanilla blocks and use it on the chest, or
   B) use /setblock to change the facing= parameter.

I use it to make more maxed-out chests as needed....but I shouldn't be able to do that.

Okay interesting, shall take a look at this as it likely affects both fabric and forge.