What behavior is observed:

When I am using command /skin nick on client, I get Warn message. Skin doesn't change. It changes after relogin.

What behavior is expected:

Skin changes after a second.

Steps/models to reproduce:

Environment description

Bungecord: 1.18
Paper: This server is running Paper version git-Paper-163 (MC: 1.18.1) (Implementing API version 1.18.1-R0.1-SNAPSHOT)

Plugin version or build number (don't write latest):

ChangeSkin Build #327 (both bungee/spigot)

Server Log:

[00:58:09 WARN]: [ChangeSkin] Cannot find 1.16x fields java.lang.NoSuchMethodException: net.minecraft.world.level.World.isDebugWorld() at java.lang.Class.getDeclaredMethod(Class.java:2675) ~[?:?] at com.github.games647.changeskin.bukkit.task.SkinApplier.<clinit>(SkinApplier.java:87) ~[ChangeSkinBukkit (7).jar:?] at com.github.games647.changeskin.bukkit.bungee.SkinUpdateListener.onPluginMessageReceived(SkinUpdateListener.java:30) ~[ChangeSkinBukkit (7).jar:?] at org.bukkit.plugin.messaging.StandardMessenger.dispatchIncomingMessage(StandardMessenger.java:455) ~[paper-api-1.18.1-R0.1-SNAPSHOT.jar:?] at net.minecraft.server.network.ServerGamePacketListenerImpl.handleCustomPayload(ServerGamePacketListenerImpl.java:3184) ~[?:?] at net.minecraft.network.protocol.game.ServerboundCustomPayloadPacket.handle(ServerboundCustomPayloadPacket.java:38) ~[?:?] at net.minecraft.network.protocol.game.ServerboundCustomPayloadPacket.handle(ServerboundCustomPayloadPacket.java:7) ~[?:?] at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$1(PacketUtils.java:56) ~[?:?] at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.18.1.jar:git-Paper-163] at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:149) ~[?:?] at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:23) ~[?:?] at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1413) ~[paper-1.18.1.jar:git-Paper-163] at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:189) ~[paper-1.18.1.jar:git-Paper-163] at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:122) ~[?:?] at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1391) ~[paper-1.18.1.jar:git-Paper-163] at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1384) ~[paper-1.18.1.jar:git-Paper-163] at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:132) ~[?:?] at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1362) ~[paper-1.18.1.jar:git-Paper-163] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1268) ~[paper-1.18.1.jar:git-Paper-163] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:317) ~[paper-1.18.1.jar:git-Paper-163] at java.lang.Thread.run(Thread.java:833) ~[?:?]