Entities can travel through blocked off nether portals

Players and entities can use nether portals that are blocked off by standing in a corner.

Steps to Reproduce:

  Step 1: Make a blocked off nether portal similar to the image below,

  Step 2: Go into the corner as close to the portal as possible.

Observed Results:

Players and entities will be able to use the portal.

Expected Results:

The portal would not transport entities, like in 1.21.1.