In the latest beta, we can finally see transparent blocks through water, that's amazing! That includes slime blocks, but they have a problem...
Water with slime blocks above doesn't render the top part.
(It says 1.2.20.2 but the version is 1.5.0.0, it just wasn't avaiable to select.)
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Affects 1.12.1.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-62255 due to the more general or descriptive summary.
Your votes, additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
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Still happens on 1.8.0