9.724 Carried items near a trade beacon appear twice in the trader list.

[OldVamp]

as title says
I noticed it once, when I reopened the trade window to confirm it didn't happen a 2nd time.

One colonist was carrying corn to the trade stockpile
it appeared twice in the list at the stored amount, and the carried stack amount
at different sell prices.

[Matthiasagreen]

The items robustly have two different levels of wear. If one corn is at 89% and another at 50% they become two different items with two different prices. Hence being listed twice.