I don't know the exact variables to reproduce but in summary, my test environment:
Minecraft Server with 2 players (at least)
This properties file: https://hastebin.com/logegepopi.ini
Playing the game
This is a bug that's difficult to reproduce, but once it occurs it's really, really annoying. So I suggest someone revising the spawn code to be more precise in what it does, maybe also distribute the mob spawning per player a bit wiser. In any case, it's a pain in the a to talk to each server admin telling them their server is broken and hostile mobs don't spawn frequent at all, definitely doesn't seem like ```players * 70 / chunkstuff = mobcap``` or something along these lines.
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AgentM
It's different in as it's nothing to do with the view distance at all. Just buggy behavior on servers.
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Can confirm that its still a thing in 1.13pre6.. Again, insanely stupid to reproduce but i found that if 2 players are within a radius of eachother, only in between them a small amount spawns
Asteraoth
Is this still an issue in Minecraft 1.13.1?
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It is still a thing in 1.13.1 and its because 1.13 changed the spawning system entirely, instead of subchunk checks it now does block by block checks and mobs can no longer spawn inside of eachother.. I dont know if it works as intended tho as that means that any block above the spawning platform will slow the farm dramatically so that means no layered traditional farms that are nice looking and easy to build...
Is this different from MC-2536?