The player appears slightly higher than the required position, when he opens the shulker box, located under the minecart, in which the player sits.
Edit: As of 18w30b shulker box with boat above it can no longer be opened, but you still can open it if minecart is on top of the shulker box.
Edit 2: As of 1.14 snapshots (or earlier) shulker box with the boat above can now be opened again
What I expected to happen was...:
The shulker box must not be opened. / The player, together with the minecart/boat, must rise correctly when the shulker box is opened.
What actually happened was...:
The player appears slightly higher than the required position, when he opens the shulker box.
Steps to reproduce:
Place the rail, then place the minecart on it, or use
/summon minecart
.Place the shulker box nearby.
Roll the minecart onto the shulker box.
Sit in the minecart and open the shulker box.
Steps to reproduce (var2)
Place the shulker box.
Place a boat on the center of shulker box.
Sit in the boat and open the shulker box.
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Might be caused by MC-80877
Can confirm in 20w51a.

Cannot reproduce in 22w42a

Can someone else confirm this fixed?

Can confirm in 23w31a
The minecart still opening the shulker box, but the boat has been fixed and now can't open the shulker box if the player are in the boat