PaperMC/paper-server/patches/sources/net/minecraft/server/commands/KickCommand.java.patch

--- a/net/minecraft/server/commands/KickCommand.java
+++ b/net/minecraft/server/commands/KickCommand.java
@@ -48,7 +48,7 @@
 
             for (ServerPlayer serverPlayer : targets) {
                 if (!source.getServer().isSingleplayerOwner(serverPlayer.getGameProfile())) {
-                    serverPlayer.connection.disconnect(reason);
+                    serverPlayer.connection.disconnect(reason, org.bukkit.event.player.PlayerKickEvent.Cause.KICK_COMMAND); // Paper - kick event cause
                     source.sendSuccess(() -> Component.translatable("commands.kick.success", serverPlayer.getDisplayName(), reason), true);
                     i++;
                 }