Drowned never spawn in river biomes
I cannot get drowned to spawn in the river biomes no matter what I do. I first just searched around and would never find them naturally spawning in the rivers. I then darkened the areas to improve spawn rates, and that didn't work. I proceeded to make a super flat world that was 100% a river biome and created a large structure which I had used in 1.13 to spawn drowned in, and despite the mob cap being zero and the light level being under 7 for the entire 100x50x100 pool of water, no drowned would ever spawn. Therefore I believe this is some sort of bug keeping them from spawning in river biomes, unless I am mistaken for some reason. I also hope this isn't some secret feature, because I really miss having drowned spawn in rivers and come out to attack me, it made the night dynamic very interesting.
Environment
Minecraft Java Edition 1.13.1
Java version 8 on Windows 10
Created Issue:
Drowned never spawn in river biomes
I cannot get drowned to spawn in the river biomes no matter what I do. I first just searched around and would never find them naturally spawning in the rivers. I then darkened the areas to improve spawn rates, and that didn't work. I proceeded to make a super flat world that was 100% a river biome and created a large structure which I had used in 1.13 to spawn drowned in, and despite the mob cap being zero and the light level being under 7 for the entire 100x50x100 pool of water, no drowned would ever spawn. Therefore I believe this is some sort of bug keeping them from spawning in river biomes, unless I am mistaken for some reason. I also hope this isn't some secret feature, because I really miss having drowned spawn in rivers and come out to attack me, it made the night dynamic very interesting.
Environment
Minecraft Java Edition 1.13.1
Java version 8 on Windows 10



Cannot reproduce
[Mod] tryashtar, maybe it possibly spawned in a non-river biome a few blocks further away. Or did you try that in a river buffet world?
I used a river buffet world. Here's a picture from inside a large pool of water I created in the problem area. It should be noted that I am on a server, but we ensured the mob cap was not reached and also that everybody in the server was in this area. The server has nothing that would prevent mob spawnings, and we are on hard mode. I built the tub of water high in the sky, to ensure that the drowned were the only mobs being spawned.
Appears to be fixed. See 2019-03-26_23.25.11.png
.