Shulker boxes cannot be opened when blocked by fences even though they visually should be able to

Can confirm for MC 1.12.1.

Can confirm in 21w06a.

Can confirm in 1.16.5 and 21w08b.

This is because it just checks for the collision box. Because the fence/wall is 1.5 blocks high it blocks the shulker box.

Can confirm in 21w15a.

Can confirm in 1.17.

Can confirm in 1.17.1.

I am able to confirm this behavior in 21w41a. Here are some extra details regarding this problem.

The Bug:

Shulker boxes cannot be opened when blocked by fences even though they visually should be able to.

Steps to Reproduce:

• Build the setup as shown in the attachment below.

• Attempt to open the shulker box.

• Take note as to whether or not shulker boxes can be opened when blocked by fences in situations where they visually should be able to.

Observed Behavior:

Shulker boxes cannot be opened when blocked by fences even though they visually should be able to.

Expected Behavior:

Shulker boxes would be able to be opened when blocked by fences in situations where they visually should be able to.