Currently affected blocks:
Cauldrons
Fences
Cake (under conditions of MC-106826)
Interacting with these blocks with items in hand correctly cause no hand animation (provided the item itself doesn't have a special use for these blocks). Since clicking on these blocks does not open up a GUI, nor does it modify any block states, the hand animation probably shouldn't be there.
Flower pots (MC-160993), signs and bells also cause the hand animation to play, but this is different in that it overrides item interactions as a whole (see MC-160926).
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Fixed in 19w42a

@unknown, so is this fixed now or what, because you have added 19w42a to the affected version list?

Don't remember adding that, probably a mistake.
EDIT: maybe it was intended for MC-160897.