There was some water in a cave, and I blocked off the water source because it was annoying and was making it hard to move around, and the water at 1/8 hight stayed, even though the water source, or any other water source, wasn't touching it.
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Thank you for your report!
We're actually already tracking this issue at MCPE-50540, so I will resolve and link 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.
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