When you're running in a 2 block tall tunnel in 3rd person, your view will go through the blocks every once in a while and its basically an Xray bug.
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violine1101
Thank you for your report!
However, this issue is a Duplicate of MC-19222 and will be closed accordingly.
It will be linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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