What happened?

Unlike staying true to vanilla's (superior) implementation of the fix for https://bugs.mojang.com/browse/MC-3366, the end portal bottom is rendered as if the portal block's hitbox extends all the way to the bottom of the block space (which was the case for 1.16 and below), instead of only half way (which is how it works in 1.17 and above). This not only looks worse than vanilla, but also lets the player clip their camera inside of the end portal texture without being teleported, as demonstrated by this video. https://youtu.be/Z6LDzzPZVis

Screenshots

Relevant log output

No response

Iris and Minecraft Version

Minecraft 1.17.1, Iris 1.1.2

Are you running Sodium along with Iris?

Yes

Operating System

Windows 10

What is your GPU?

GTX 1050 Ti

Java Version

Java 16

Additional context

No response

Fixed in development branches with #861 being merged (well, effectively merged)