Although MC-3366 fixed the end portal block being visible from the bottom, it is still invisible when viewed from the side. If the portal effect was applied to the side, it may end up looking a lot like a gateway portal, so an alternative fix would be to shrink the hitbox so it has no thickness.

Steps to Reproduce

• Summon an end portal block.

  /setblock ~ ~ ~3 minecraft:end_portal
  

• Look at the sides of this block.
• Take note as to whether or not end portals are transparent from the sides.

Observed Behavior

End portals are transparent from the sides.

Expected Behavior

End portals would not be transparent from the sides. Instead, they should have some kind of side texture and not just be completely transparent or the end portal block itself should be made thin so that it doesn't have a side texture.