You could teleport through blocked end portals with very fast speed.

This doesn't happen in 1.21.1.

This also affects nether portals in creative(I didn't test end gateways)

Steps to reproduce:

1.Create a superflat world, build and lit an end portal centered at (20, -60, 20).

2.Block the end portal with solid blocks.

(Shown in the picture)

2./tp @s 39.7 -60 37.7 135.1 0

3./effect give @s minecraft:speed 100 255

4.Hold Sprint and run forwards.

Observed result:

You could teleport through the end portal.

Expected result:

You won't teleport through the end portal since it's blocked.