Hello. The problem is as follows, the horde attacks every night, and also they do not burn during the day as it was set in the settings (Although it may be because of the late setting, already when they appeared). The settings are such that their chance of spawning 5% so even with a gap of 45 days, and they are already 4 nights in a row spawned.

Yes, everything works correctly now, but maybe it seemed to me that the settings of the days before the horde spawned, did not update when changing the cfg. I don't know if it's a bug. In the new world everything works fine. I suggest by the way to give the player the ability to customize the hordes in terms of spwning entities. By adding new mobs or their variations. Thank you for the fix, and I apologize for the length of time it took to test.

Thanks for testing and good to hear that it works now :)

customize the hordes in terms of spawning entities

you mean customize what mobs spawn? Like adding Creepers to a Horde?

The ad astra mods are the problem, my check for overworld or not, breaks with those mods installed

I'm looking for a way to change my check

Okay, the burning problem is a conflict with the mod was Apocalypse.

thanks for the report.
can you please do the following:

• what version are you on?
• Fabric, Forge, NeoForge?
• post you config
• enable the config option "print debug messages", let the game run several in game days, post the log

1.20.1 Fabric
Config:
{
// If true, Nights of the Undead (horde nights) are enabled | default: true
"undeadNightsEnabled": true,
// Days between horde nights (1 = every night is a horde night) | default: 5
"daysBetweenHordeNights": 45,
// Chance in % for a horde night | default: 100
"chanceForHordeNight": 5,
// If true, each night a message will be sent to the player with how many nights are left before the next Horde Night | default: false
"sendHordeNightsCountdownMessage": false,
// Minimum distance a horde will spawn away from the player | default: 70
"distanceMin": 170,
// Maximum distance a horde will spawn away from the player | default: 75
"distanceMax": 180,
// Size of a wave of zombies | default: 15
"zombieHordeWaveSize": 50,
// Maximum amount of zombies that can be loaded in the world at the same time | default: 80
"hordeZombiesSpawnCap": 120,
// If true, additional waves can spawn in a horde night | default: true
"spawnAdditionalWaves": true,
// Time in seconds between check for next possible wave in a horde night | default: 45
"cooldownBetweenWaves": 180,
// Chance in % for another zombie wave | default: 7
"chanceForAdditionalWaves": 5,
// If true, Players can't sleep through horde nights | default: true
"hordeNightsDisableSleeping": true,
// If true, the horde zombies will be persistent and not despawn | default: false
"persistentZombies": false,
// If true, the horde zombies will burn in daylight | default: false
"zombiesBurnInDaylight": true,
// If true, demolition zombies with TNT will spawn | default: true
"spawnDemolitionZombies": true,
// Chance in % for a demolition zombie to spawn | default: 6
"chanceForDemolitionZombieToSpawn": 6,
// TNT Stack size a demolition zombie will spawn with (0 = unlimited) | default: 3
"demolitionZombieTntStackSize": 3,
// If true, elite zombies will spawn | default: true
"spawnEliteZombies": true,
// Chance in % for an elite zombie to spawn | default: 3
"chanceForEliteZombieToSpawn": 5,
// If true, single stray horde zombies can spawn on normal nights | default: true
"spawnStrayHordeZombies": true,
// If true, debug messages will be logged out | default: false
"printDebugMessages": true
}
I've enabled the item showing the debug, I'll wait now and send you its result.

https://mclo.gs/h1mhV8e

Here I was in this new flat world trying to figure out what the problem was. Other mods to improve mobs are disabled. I only set the time to 11900 which was close to the horde spawn and it showed up every time.
The log file may be bigger than it needs to be, sorry.

I just ran a quick test server with your settings and it worked fine, the days were counting down normally from 45.
(btw with your settings you would only have a 5% change for a horde night every 45 days, which would be quite seldom)

Do you have any mods installed that alter the tick speed and/or the dimensions or night/day cycles?

I have a compilation of mods, but there isn't anything specific to replace it, I don't think. Can it be something because of mods on optimization? In the logs do not see the mods that are loaded?

It's just that they're rare, and they're every day.

Yeah I saw quite a few mods, but I don't know in detail what each mod does.
What mod optimizations are you using?

please check the new release 0.9.5 (if that fixes the issue):
https://modrinth.com/mod/undead-nights/version/0.9.5-Fabric-mc1.20.1