Expected Behavior

Pick up object with inventory and place it back down.

Actual Behavior

Object is picked up, but all of it's contents are duplicated and dropped on the floor.

Steps to Reproduce

Happens every time so far.

It occurs with
Storage Drawers - Contents, including drawer upgrades are duplicated.
Bibliocraft objects, like bookcases. shelves, chests, etc...
Electroblob's Wizardy - arcane workbench duplicates items in it's inventory if picked up.
Thaumcraft - duplicates items stored in Thaumcraft blocks, such as arcane workbench vis crystals. Essentia smeltery duplicates stored inventory.

Seems to work fine with IronChests mod and Thermal Expansion machines.

Version of Minecraft, Carry On, Forge

forge-1.12.2-14.23.3.2680-universal
CarryOn+MC1.12.2+v1.9

Screenshots encouraged

Damn, I should have done more thorough testing... will have hotfix tomorrow, probably.
Thanks for the quick report.

Edit: I got a fix out today anyway... please check it out and report back if it works.

Tested the new build and it works great! Thank you.

Glad to hear!