Structure blocks don't display their mode and name when looked at

Affects 1.16.2

Confirmed for 1.16.3

This is caused by a refactor, which looks like it happened in 1.13, to block entity rendering. In 1.12, `BlockEntityRenderer.render` used to render the display name of a block entity if it had a name to display. `StructureBlockRenderer.render` used to call the superclass method. Now (at least in 1.16), the `BlockEntityRenderer.render` method is abstract and the code for rendering nameplates appears to have been removed (either by accident or by proguard).

As a side note, in 1.12, most block entities didn't call `super.render` even though the corresponding block entities overrode the method to get the nameplate, so didn't end up displaying the nameplate, which was probably a bug.

Can confirm in 21w03a.

Can confirm in 21w05b.

Can confirm in 21w06a.

Can confirm in 1.16.5 and 21w08b.

Can confirm in 1.17.1. Video attached.

Can confirm in 21w37a.

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

The Bug:

Structure blocks don't display their mode when looked at.

Steps to Reproduce:

• Summon a structure block with its "mode" set to "data".

/setblock ~ ~ ~ minecraft:structure_block[mode=data]

• Look at the structure block and take note as to whether or not it displays its mode when looked at.

Observed Behavior:

Structure blocks don't display their mode when looked at.

Expected Behavior:

Structure blocks would display their mode when looked at.

Can confirm in 1.18.1.

Can confirm in 1.18.2.

Can confirm in 1.19 and 22w24a.