If you place a bottom half slab and waterlog it over air, then break the slab, the water will not flow, but if you give the water a block update, it will start flowing again, and if you place the slab back where it was before, the water will continue to flow even though it shouldn't, which can be fixed by placing a block underneath the slab.
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[Mod] OcelotOnesie
Thank you for your report!
We're actually already tracking this issue at MCPE-34237, 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.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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