Not sure whether this applies to anything else but after typing "dispenser" in the recipe book, a dispenser appears in the search results and clicking on it wil result in the recipe for dropper, making players accidentally craft the wrong thing.
MC-130771
Recipe Book Acting Up
Resolved
Duplicate
0
Bogdan Barbu
(Unassigned)
Unconfirmed
Minecraft 1.13-pre1
Retrieved
I am unsure when this happens because it doesn't seem to be deterministic.