The bug
Water placed within the bounds of the world border are capable of flowing out of it.
This was originally reported as MC-54772, which was resolved as a duplicate of MC-54119, which was fixed in 1.18 Pre-release 1, but this specific behaviour has still no been fixed.
How to reproduce
Go to the world border
Place a liquid source block which would flow outside of the world border
Expected results
As terrain outside of the world border is meant to be protected, the water/lava would not flow outside of the world border, either stopping or treating it as a solid block.
Actual results
It flows outside of the world border anyway.
Linked issues
Attachments
Comments 2
Thank you for your report!
We're tracking this issue in MC-82007, so this ticket is being resolved and linked as a duplicate.
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This ticket actually appears to be a duplicate of MC-82007.