Slime/Honey blocks do not render when under a slime, this can be seen with the slight transparency of the slime.
Update: This also seems to be the case with water, it will not render when the player is looking at it through a slime.
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violine1101
migrated
Thank you for your report!
We're actually already tracking this issue in MC-161885, so I resolved and linked 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 in the future to see if the issue has already been reported.
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