It appears that the water in this certain location isn't flowing when it should be. If the block is updated, it does flood the area. I've found that this happens on a server of this seed as well as a single player world.
Seed: 341396130486171101
Location: 116 62 -81
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Thank you for your report!
We're actually already tracking this issue in MC-5128, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. That means that this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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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