Custom end portals give fall damage to players and are lethal if built over y level 75

Steps to reproduce

1. Build an end portal above Y = 75.
2. Switch to survival mode.
3. Enter the portal.

Expected result

You spawn safely on the end spawn platform.

Observed result

You die of fall damage on the end spawn platform.

---

When traveling through an end portal that is higher than the standard generated end portals i.e. custom made portals the player will receive fall damage based on the y level of the overworld side end portal. this leads to end portals over y level 75 killing unarmoured players and over level  100 killing everyone.

 

I have included a test world with portals at spawn on multiple y levels for test