When dropping down half on to a block and half on to water, the water will drop blue particles and not the block that the player lands on.
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Thank you for your report!
We're actually already tracking this issue in MC-1133, 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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