The coffee machine got a little hungry overnight and ate the frother jugs! This has been sorted out, and you should be able to find yours again.
V.1.0.6
Hotfix: The Missing Milk Frother Jugs Are Back
Source: Steam Community (opens in a new tab)
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 25302924 · public branch
Steam updated · First observed