Ensure gameLoop function gets selectors applied.

nms-patches/CustomFunction.patch

@@ -0,0 +1,11 @@
+--- a/net/minecraft/server/CustomFunction.java
++++ b/net/minecraft/server/CustomFunction.java
+@@ -130,7 +130,7 @@
+         }
+ 
+         public void a(CustomFunctionData customfunctiondata, ICommandListener icommandlistener, ArrayDeque<CustomFunctionData.a> arraydeque, int i) {
+-            customfunctiondata.a().a(icommandlistener, this.a);
++            CommandBlockListenerAbstract.executeSafely(icommandlistener, new org.bukkit.craftbukkit.command.CraftFunctionCommandSender(icommandlistener), this.a); // CraftBukkit
+         }
+ 
+         public String toString() {

src/main/java/org/bukkit/craftbukkit/command/CraftFunctionCommandSender.java

@@ -0,0 +1,47 @@
+package org.bukkit.craftbukkit.command;
+
+import net.minecraft.server.IChatBaseComponent;
+import net.minecraft.server.ICommandListener;
+import org.bukkit.craftbukkit.util.CraftChatMessage;
+
+public class CraftFunctionCommandSender extends ServerCommandSender {
+
+    private final ICommandListener handle;
+
+    public CraftFunctionCommandSender(ICommandListener handle) {
+        this.handle = handle;
+    }
+
+    @Override
+    public void sendMessage(String message) {
+        for (IChatBaseComponent component : CraftChatMessage.fromString(message)) {
+            handle.sendMessage(component);
+        }
+    }
+
+    @Override
+    public void sendMessage(String[] messages) {
+        for (String message : messages) {
+            sendMessage(message);
+        }
+    }
+
+    @Override
+    public String getName() {
+        return handle.getName();
+    }
+
+    @Override
+    public boolean isOp() {
+        return true;
+    }
+
+    @Override
+    public void setOp(boolean value) {
+        throw new UnsupportedOperationException("Cannot change operator status of server function sender");
+    }
+
+    public ICommandListener getHandle() {
+        return handle;
+    }
+}

src/main/java/org/bukkit/craftbukkit/command/VanillaCommandWrapper.java

@@ -158,6 +158,9 @@ public final class VanillaCommandWrapper extends Command {
         if (sender instanceof ProxiedCommandSender) {
             return ((ProxiedNativeCommandSender) sender).getHandle();
         }
+        if (sender instanceof CraftFunctionCommandSender) {
+            return ((CraftFunctionCommandSender) sender).getHandle();
+        }
         throw new IllegalArgumentException("Cannot make " + sender + " a vanilla command listener");
     }