Shulker rendering position desync and generates ghost shulker when destroying shulker-ridden boat or minecart

Please attach a video of this issue.

• New video. 🙂

Confirmed and edited description. Is there a way to reproduce this with minecarts?

Now(15w45a) seems difficult to prove in minecart.
Probably because MC-88336 / MC-92165

Confirmed for

• 16w04a

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The following is based on a decompiled version of Minecraft 1.10 using MCP 9.30.

This happens because the method net.minecraft.entity.monster.EntityShulker.setPositionAndRotationDirect(double, double, double, float, float, int, boolean) overrides its parent method to not set the correct position.

Note: Client-side the shulker will still appear for some ticks in the ground. This happens because the boat sets offsets the y position of the shulker by -0.1, as the shulker has no y offset (see MC-90084). This means its y value will be .9 of the block below.

Re-occurred at 19w45b.
But not easy to reproduce.

I can't seem to reproduce this issue in 20w06a.
If someone successfully reproduces this issue, please reply below and the issue will be reopened.

Mobs now dismount vehicles only in front of the boat.

Sometimes when testing MC-174216, this issue still appears.