Howdy again!

I recently started a new world on Multiverse on our test server to restart our survival test - one of the first things I noticed was the lack of mobs on the surface of the Overworld and I have since then managed to narrow down the reason to EHM.

To confirm that EHM was the cause I made an absolutely clean test server - downloaded the latest Paper, latest EHM from SpigotMC, latest dev version of EssentialsX and latest Plugman as the only plugins on the server. The only things I changed in the server configs were the mob cap (70->140), difficulty 1 -> 3 and server seed. I also made myself the OP. I did not touch any of the plugin configs.

Surface with EHM on after butchering all mobs.

Surface after disabling EHM and butchering all mobs.

Each time essentials reports that it butchered 140ish mobs, but in the case of EHM they seem to be packed underground(?). Only a few times have I seen surface mobs (mostly charged creepers, zombies, a single endermen) with EHM enabled.

I will also test this on the latest Spigot and report back.

Huh. Wondering if this has to do with the "spawn this mob instead if in this biome with configurable percentage" feature that was relatively-recently added.

Well, it seemed there was no difference between Paper / Spigot, however I found out where the mobs were

For whatever reason, they seem to have all spawned on the desert biome. Not sure what this means, but I would certainly appreciate a more vanilla distribution.

EDIT: Looks like they only like spawning on sand? Found some mobs in a beach in a plains biome...

I can confirm, having this EXACT same behaviour and it's really saddening.
Mobs will spawn in deserts, water & caves but never in any other biome on the surface

i have same problem !
CraftBukkit version git-Spigot-f56e2e7-9dc5658 (MC: 1.13.2) (Implementing API version 1.13.2-R0.1-SNAPSHOT)
[ExtraHardMode] Enabling ExtraHardMode v3.13.1-59445b0

Thanks for the info. This issue came in around one of the busiest moments of my life so I haven't been able to troubleshoot this. Could you guys try seeing if disabling options in the config (perhaps setting the spawn chance in biome setting to 0%) resolves this?

for the moment, the tests I have done is to remove all the plugins from the server, I kept only, Vault, protocolib and pex (permissionsEx).
I'm looking for where I can change the percentage of appearance of 'Mobs' but I find nowhere this option!
Here is my configuration, if you can tell me the number of the line it would be simpler.
https://pastebin.com/3bCnuAjr

Upon further testing, the bug seems to be related to "Inhibit Monster Grinders: true" - when I switch this setting to false, the monsters begin spawning normally on the overworld - the bug returns as soon as the option is set back to true. I used a fresh config, changing nothing but this option to ensure that it was the root cause.

Ooh, thanks for that info psycholynx. Can you enable the debug config option?

I'm thinking this might be a case of checking grass instead of grass_block

Yup, that's the issue.

https://github.com/MLG-Fortress/ExtraHardMode/blob/master/src/main/java/com/extrahardmode/module/BlockModule.java

On phone right now so will fix later.

Lovely! As for the debug, there seemed to be nothing special in there I got when flying around with the option enabled, sans messages about spider drops: https://pastebin.com/HkrR4v7h

I'll take the initiative to go check up on the animal limits bug with the debug on and see if I can't add to that.

206/5000
actually, that solved the problem, thanks.
Now I do not know how to configure the gravity in the cave so that the 'dirt' falls! in the video we see the 'dirt' create a scree!
but, maybe it comes from the same problem with 'grass or grass_block'?
Because in this section I have not changed anything, everything is by default.
-inhibit tunneling section , i can put wood ? I would like to prevent the player from picking up wood with his hands only?
if so, I would like to know the name of the exact item to put under [stone, oak_wood, Birch_wood]?

for the moment :) i will put Inhibit Monster Grinders: true when you update the plugin :)

Thank you kindly!