Damage overlay/cracks use a weird perspective related to camera view instead of being static.
The attached video shows this bug in action.
This is easily reproduced by just booting up a MC world or connecting on a server and trying to break blocks.
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duplicates 1
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Thank you for your report!
We're actually already tracking this issue in MC-161853, so I resolved and linked this ticket as a duplicate.
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this should be a feature where the damage overlay, appears on any spot on the block randomly