There is a minor bug where the console has a few instances with the following error periodically.
[Server thread/ERROR]: Could not pass event CreatureSpawnEvent to DistributedMobSpawns v2.1.1
java.lang.NullPointerException: null
The error appears to report in groups of approximately 4 or 5 lasting at most a minute before the console is error free for a while. This repeats after 1-2 minutes. If I were to guess I'd say it looks most like the plugin getting stuck on one mob until that mob despawns or dies.
I am running v2.1.1 of Distributed Mob Spawns
Server Information
Running Paper version git-Paper-626 (MC: 1.13.2) (Implementing API version 1.13.2-R0.1-SNAPSHOT)
Java Version '1.8.0_212'
Plugins (27): AnimatedFrames, BuycraftX, CoreProtect, CrazyCrates, CustomCommands, DistributedMobSpawns, Dynmap, Dynmap-WorldGuard, EssentialsX, FishinRoulette, GCore, Harbor, Holographic Displays, LuckPerms, MapManager, NuVotifier, PacketListenerAPI, PlanAnalytics, PlayerHeads, Shopkeepers, SuperbVote, Vault, WorldBorder, WorldEdit, WorldGuard