If a banner is behind a Nether Portal and you look through the Nether Portal, the banner still shows as if the Nether Portal isn't there without a purple gloss from the portal or any distortion from the portal swirls.
Here is a link to a video showing what I mean: https://mega.nz/file/4QgCgAKD#2Axy8UjHXvnJi-dS971ut6orc2ym4LXUQAZdQP4IOUw
Steps to Reproduce:
- Build a Nether Portal, preferably in the center of a room.
- Place banners throughout the room you built the Nether Portal in.
- Look through the Nether Portal at the Banners
Banners appear normal and unaffected by any interference as if the Nether Portal is not present.
Banners like all other mobs, blocks, etc. should appear distorted from the portal swirl when looking through a Nether Portal as well as have a purple tint applied to them from the Nether Portal itself.