Belt of the Performer +1 Marked as Plot

[Kalgoon]

Description
==========
An item I found from a chest I believe is from the OC in the Base game, and is marked plot, so it does not sell to the appropriate NPC.

Steps to reproduce
----------------------------
1) Find a Belt of the Performer +1
2) Attempt to sell it to an NPC.
3) Notice 0g selling price and the plot message.
4) Lament.

Expected result
-----------------------
I expected to get 300+ gold for selling it.

Actual result
-------------------
It takes up space and weight in my inventory.

Screenshot(s)
--------------------

Notes
---------
Base game item you get from Sharwyn in the OC, I think. Maybe it's a tip of the iceberg thing and other items might be seeping in that don't belong, assuming it doesn't belong.

[Anatida]

This was not the herb bags fault. Fix is in the pipeline. Thank you for the very detailed report!