When using "dx", "dy" and "dz" arguments to select an entity with commands, the hitboxes of mobs are elongated a block in the negative direction.
In the screenshots, I am using a datapack that creates particles at the mob where the player looks (using dx, dy and dz to detect the mob).
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Thank you for your report!
We're actually already tracking this issue in MC-123441, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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