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
Observed Results:
Banners appear normal and unaffected by any interference as if the Nether Portal is not present.
Expected Results:
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.
Related issues
Comments

Done.

Thank you for your report!
We're tracking this issue in MCPE-130262, so this ticket is being resolved and linked as a duplicate.
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Can somebody please update this bug report to Bedrock Codebase from Java Edition please? I chose Bedrock Codebase and when the report was submitted, it switched to Java Edition for some reason and I cannot switch it back.