Nether setworldspawn inconsistency

When setting the world spawn in the nether with /setworldspawn, the roof is considered a valid placement for entities who leave the end through the end portal, but not for players.

Expected behavior:

Entities and players should both appear inside the logical height of the nether dimension.

Steps to reproduce:

1. Run /setworldspawn anywhere in the nether

2. Go to the end and drop some entities into the exit portal

3. Jump into the exit portal

4. Notice that you are inside the normal nether area, while the entities are on top of the bedrock roof