End portals and end gateways held by endermen or as block display entities are not rendered, but nether portals are

Some info

This issue is an inconsistency between the three types of portal blocks. It is a re-evaluation of MC-54462, as since then, end portals and end gateways have been changed to be unobtainable.

The bug

While nether portals are rendered while being held by endermen or as block display entities, end portals and end gateways are not. One could expect that end portals and end gateways are rendered as well while being held by an enderman or as block display entities.

How to reproduce

Endermen

1. Run the command:

   /summon minecraft:enderman ~ ~ ~ {NoAI:1,carriedBlockState:{Name:"nether_portal"}} 

2. Run the command:

   /summon minecraft:enderman ~ ~ ~ {NoAI:1,carriedBlockState:{Name:"end_portal"}} 

3. Run the command:

   /summon minecraft:enderman ~ ~ ~ {NoAI:1,carriedBlockState:{Name:"end_gateway"}} 

Block displays

1. Run the command:

   /summon minecraft:block_display ~ ~ ~ {block_state:{Name:"minecraft:nether_portal"}} 

2. Run the command:

   /summon minecraft:block_display ~ ~ ~ {block_state:{Name:"minecraft:end_portal"}} 

3. Run the command:

   /summon minecraft:block_display ~ ~ ~ {block_state:{Name:"minecraft:end_gateway"}} 

Observed result

End portals and gateways are not rendered while held by endermen or as block display entities, though nether portals are.

Expected result

All of the mentioned blocks would be rendered while held by endermen or as block display entities.