Glowsquids Spawn At The Top Of Rivers Etc

Glowsquids are spawning at the top of river biomes (around Y=60) instead of below y=30 like the changelogs say they should

How to reproduce
1. Create a new world with seed: 1547711773
2. Go to the nice river/cavey area around -368 75 -324
3. Wonder around this around, walking/flying around the watery areas and you'll see glow squids spawn at the surface of the water

It seems like a water filled cave system has generated right below the surface, and combined with a normal river, so glow squids might think they can spawn here. Regardless, it's not underground, and its far to high up for them to normally spawn