Water just above sea grass or kelp (it doesn't have to be surrounded by anything) appears invisible when there is no other water in the chunk.
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Environment
Windows 10 Java 8
Linked issues
is duplicated by 8
MC-125819
Tridents being too loyal and invisible water
Resolved
MC-125633
Invisible water
Resolved
MC-125659
Water Texture disappears when slabs are placed underneath
Resolved
MC-125715
Sea Grass makes water disappear??
Resolved
MC-125788
Water is invisble when slabs are in certain positions
Resolved
3 more links
See MC-125216 for the first half of your ticket.