When you are standing directly to a hopper, you can see through it through a small line. This is a small rendering issue on the latest 1.19 bedrock edition.
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Thank you for your report!
We're tracking this issue in MCPE-55122, 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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If you need more information, I am happy to give it