Hi i've been playing with this plugin on my minecraft server but it seems to have a big problem.
Environment

openjdk version "1.8.0_282"
OpenJDK Runtime Environment (build 1.8.0_282-b08)
OpenJDK 64-Bit Server VM (build 25.282-b08, mixed mode)

Server software: [21:29:10 INFO]: This server is running CraftBukkit version git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd (MC: 1.8.8) (Implementing API version 1.8.8-R0.1-SNAPSHOT)

Plugins: [21:28:34 INFO]: Plugins (22): AdvancedTabOverlay, AnimatedNames, ClientDetector, Essentials, FastAsyncWorldEdit, FeatherBoard, FeroxCore, LiteBans, LuckPerms, Multiverse-Core, MVdWPlaceholderAPI, NametagEdit, PlaceholderAPI, PlugMan, ProtocolLib, ServerListMotdSpigot, SimpleRename, Vault, ViaRewind, ViaVersion, VoidGenerator, WorldEdit

Problem description
When playing the game and taking damage while being in spectator gamemode the plugin seems to cause a malfeasance in events firing, as all damage will teleport you back to the spectator spawn, this includes falldamage and player to player damage. Please take a look at the video i've sent below to see a demonstration of this grave error in programming.

Maps affected:

• Sphinx
• Castle
• Sahara
• Fallen

Errors in console

[21:15:29 WARN]: [Multiverse-Core] Task #5936 for Multiverse-Core v4.1.1-1.8.8-SNAPSHOT-b4 generated an exception
java.lang.IllegalStateException: Lost reference to bukkit world 'world2'
at com.onarandombox.MultiverseCore.MVWorld.getCBWorld(MVWorld.java:509) ~[?:?]
at com.onarandombox.MultiverseCore.listeners.MVPlayerListener$2.run(MVPlayerListener.java:357) ~[?:?]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:64) ~[patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:412) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:893) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:365) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:823) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:724) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]
[21:15:29 WARN]: [Multiverse-Core] Task #5937 for Multiverse-Core v4.1.1-1.8.8-SNAPSHOT-b4 generated an exception
java.lang.IllegalStateException: Lost reference to bukkit world 'world2'
at com.onarandombox.MultiverseCore.MVWorld.getCBWorld(MVWorld.java:509) ~[?:?]
at com.onarandombox.MultiverseCore.listeners.MVPlayerListener$2.run(MVPlayerListener.java:357) ~[?:?]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:64) ~[patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:412) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:893) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:365) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:823) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:724) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]
[21:15:29 WARN]: [Multiverse-Core] Task #5938 for Multiverse-Core v4.1.1-1.8.8-SNAPSHOT-b4 generated an exception
java.lang.IllegalStateException: Lost reference to bukkit world 'world2'
at com.onarandombox.MultiverseCore.MVWorld.getCBWorld(MVWorld.java:509) ~[?:?]
at com.onarandombox.MultiverseCore.listeners.MVPlayerListener$2.run(MVPlayerListener.java:357) ~[?:?]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:64) ~[patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:412) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:893) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:365) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:823) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:724) [patched_1.8.8.jar:git-SportPaper-92c8b95-P.c67d9f4-SP.233af53-CB.c2e0bbd]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]

Visual evidence
https://user-images.githubusercontent.com/63594063/146993294-c8cd7f8a-649e-4f77-a29e-af6464862c3b.mp4

Other issues

• Spawning in the void
• Spawning in the main world
• Scoreboard having strange spacers every now and then
• Players having blinking names (their name switches from color)
• The 2nd map after restarting is always broken because you continually fall into the void
• You sometimes spawn in the old map
• You can build outside arena bounds
• You can see the normal world outside arena bounds
• You can kill spectators
• Clones appear of players
• Gametime in the tablist will increase when there's no active game
• Stats are reset randomly

Issue between computer and chair

Originally posted by @Wqrld in #3 (comment)