I noticed this in version 21.01, but I checked the new version, and this bug still exists (although the town was renamed from Ildrim to Darvonis).

At the end of the quest "Mahhjat's Mistake", the seven bottles of "Spoiled Sutch Wine" in the player's inventory are supposed to be removed, and the dialogue reflects this. However, this item doesn't stack (I believe because it has a script on it) in the inventory, and only one of the seven individual bottles is removed. This causes the "negative weight bug" (https://en.uesp.net/wiki/Morrowind_Mod:RemoveItem) even though Morrowind Code Patch is supposed to fix that - I'll report this to Hrnchamd as well, it looks like this can still happen if RemoveItem is called from dialogue, as in this case. There seems to be even more going on, because if the the Barter window for Mahhjat is opened, even after closing the dialogue window, all bottles are removed correctly. However, if the player drops one of the bottles after they have been "removed", the game crashes when the Barter window is opened.