Using water/lava buckets or picking up fluid while the crosshair is being moved or the player is moving causes the action to take place at the crosshair as if it were a few frames back, possibly relating to MC-67665. This can result in the client showing the fluid being placed at the actual crosshair position, then disappearing and placing at a different location, or showing air where a fluid should be.
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Avoma
violine1101
Thank you for your report!
We're tracking this issue in MC-12363, 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.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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This appears to be a duplicate of MC-12363, which hasn't yet been resolved. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.