Typically upon dying, the person who died takes a a buddy for protection as they retrieve their grave to reclaim their lost inventory, carrying back to a safe location to open it: the error comes when placing it down again.

Expected Behavior

The grave be placed down in the same orientation relative to the player's facing, relative to when they picked it up.

Actual Behavior

The grave is placed down with the front always faced North, and the epitaph bearing the player's name is usually gone as well. It is accompanied by an error in the console reading:
"Error detected. Cannot place block. Execute "/carryon clear" to remove the item
Please report this error here" (linking to https://github.com/Tschipp/CarryOn/issues);
Still places grave as mentioned above.

Steps to Reproduce

Pick up a grave that spawns from a player's death, containing their inventory from when they died, then place it down again.

Version of Minecraft, Carry On, Forge

Minecraft 1.12.2
Carry On 1.12.3
Forge 14.23.5.2838
(OpenBolcks 1.7.3)

Screenshots encouraged

Screenshot 1: Approached grave.

Screenshot 2: Picked up grave from the side.

Screenshot 3: Turned 90 degrees clockwise while holding grave to demonstrate the lack of change of orientation.

Screenshot 4: Placed grave back down, and received the aforementioned error.

Strange that it still manages to place even though it sends that message. Is any data lost (apart from the orientation)?

Yeah the removal of the epitaph sounds more like shader/resource pack issues, carry on wouldn't be able to recreate data if it wasn't already there... I'll go over the checks that cause that message, because it seems to be fine otherwise.