Have you had any other images fail to display either in your inventory or in-game? Did you get any error pop-ups when this happened? Did the problem go away at any point, say, after a client refresh?
This reminds me! Over the weekend for a time my cocktail shaker was appearing as a tinker tool. I had forgotten what was in that slot, and I thought someone had given me a tinkertool or something. But I couldn't interact with it.
The problem eventually went away, though I don't know why.
So this is probably not helpful, but there you go.