This bug appears simply when you push a water source with a piston. It looks like the client think there is water and render it but server part not. You cannot drown in it and it do not flow, and there is many things you can do with it.
It do not save in the world file and if you reload the chunk, it disappears.
If you waterlog it and break the block, the water disappears.
If you climb a water column of bug-affected water sources block in survival, you will take damage.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response.
Is this still an issue in the latest version? If yes, can you please add it to the affected versions (or mention it if you are not the reporter)?
This ticket will automatically reopen when you reply.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📓 Project Summary – 📧 Suggestions – 📖 Minecraft Wiki