Sometimes when you quickly place and take water using bucket you will have water bucket in inventory, but when you place it, water will disappear
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galaxy_2alex
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-12363, which is a report that has not been resolved yet.
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That is a ghost block bug I believe, where the server thinks there is still water on the ground, whereas the client think you have picked it up, so when you place it back down the client updates. Updating the block or relogging should fix the issue.