I made a single player superflat to mess around with new features and made a tank for glow squids. If I am not in the water with the glow squids they disappear. If I am in water they appear just as they should. This issue only effects glow squids in water. If the glow squid is partly out of the water nothing happens.
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Duplicates MC-197328
This does not happen to me. Graphics -> fabulous? Turn up render distance? Not sure.