After placing a banner on one side of a normal glass block, if you go to the other side of the glass, the pixels creating the texture of the normal glass block disappear, and it looks as if the banner is in front of the glass even though you're looking from the backside of the banner and glass. It's a strange anomaly that may be fixed in a later hotfix.
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We're tracking this issue in MCPE-130262, so this ticket is being resolved and linked as a duplicate.
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