Placed banners are rendered in front of the Nether portal block texture.
Doesn't matter if they're placed on a wall or a floor, they aren't affected by the Nether portal's filter/shader.
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[Mod] OcelotOnesie
Thank you for your report!
We're tracking this issue in MCPE-130262, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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