The bug
When attempting to place a block in a position it should not be in, the hand usually does not play an animation. However, with sea pickles and turtle eggs, attempting to place one where there is already a stack of four present still causes the hand to animate.
Upon further inspection, trying to place anything against them does not seem to work.
Linked issues
relates to 1
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fixed in 18w22a

Relates to MC-129273
Can confirm that this affects 18w21b