Fake reagent has been in the bazaar for at least a few days now
I only noticed a few days ago, but it's still there now. In the regent tab, there's a single cat tail that can't be bought. Every time I try, it says that the item has already been bought, but it never disappears. Any real cat tails appear as a separate line from this fake cat tail.
In this image, only two cat tails are actually available for purchase: prnt.sc/fLeLDvifX9_7