For this all you need is water (easier to show if flowing down) and the slime looks like it is in front of the water, not behind it. This is a rendering issue with Minecraft: Bedrock Edition. This works for all sizes of slimes.
Note: This will not work if you are inside of the water, only if you are outside of it and looking through it
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[Mod] OcelotOnesie
Thank you for your report!
We're tracking this issue in MCPE-150000, 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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