PaperMC/paper-server/nms-patches/net/minecraft/server/commands/CommandList.patch

--- a/net/minecraft/server/commands/CommandList.java
+++ b/net/minecraft/server/commands/CommandList.java
@@ -37,6 +37,12 @@
     private static int a(CommandListenerWrapper commandlistenerwrapper, Function<EntityPlayer, IChatBaseComponent> function) {
         PlayerList playerlist = commandlistenerwrapper.getServer().getPlayerList();
         List<EntityPlayer> list = playerlist.getPlayers();
+        // CraftBukkit start
+        if (commandlistenerwrapper.getBukkitSender() instanceof org.bukkit.entity.Player) {
+            org.bukkit.entity.Player sender = (org.bukkit.entity.Player) commandlistenerwrapper.getBukkitSender();
+            list = list.stream().filter((ep) -> sender.canSee(ep.getBukkitEntity())).collect(java.util.stream.Collectors.toList());
+        }
+        // CraftBukkit end
         IChatBaseComponent ichatbasecomponent = ChatComponentUtils.b(list, function);
 
         commandlistenerwrapper.sendMessage(new ChatMessage("commands.list.players", new Object[]{list.size(), playerlist.getMaxPlayers(), ichatbasecomponent}), false);