To reproduce (gif attached for more info):
put any slab block exactly one block from the floor at the bottom part of second block;
surround it with any block in each direction;
fill leftover half with water;
break one of the 'wall' and let the water flow out;
restore the broken wall
[media]
Result:
Water is still floating out of the limited space.
Expected:
Water is not floating out after the wall is restored.
Note: if you build the exact same structure at more than 1 block height, it works fine:
[media]Linked issues
duplicates 1
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Comments 3

Thank you for your report!
We're tracking this issue in MCPE-45071, so this ticket is being resolved and linked 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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Thank you for your report!
We're tracking this issue in MCPE-45071, so this ticket is being resolved and linked 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 to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki