Cleaned up the code and fixed a bunch of bugs. Map server will no longer worry about base packets.

FFXIVClassic World Server/Packets/WorldPackets/Send/ErrorPacket.cs

@@ -31,7 +31,7 @@ namespace FFXIVClassic_World_Server.Packets.WorldPackets.Send
                 }
             }
 
-            return new SubPacket(true, OPCODE, 0, data);
+            return new SubPacket(true, OPCODE, session.sessionId, data);
         }
     }
 }

FFXIVClassic World Server/Packets/WorldPackets/Send/Group/PartySyncPacket.cs

@@ -27,7 +27,7 @@ namespace FFXIVClassic_World_Server.Packets.WorldPackets.Send.Group
                 }
             }
 
-            return new SubPacket(true, OPCODE, 0, data);
+            return new SubPacket(true, OPCODE, session.sessionId, data);
         }
     }
 }

FFXIVClassic World Server/Packets/WorldPackets/Send/SessionBeginPacket.cs

@@ -29,7 +29,7 @@ namespace FFXIVClassic_World_Server.Packets.WorldPackets.Send
                 }
             }
 
-            return new SubPacket(true, OPCODE, 0, data);
+            return new SubPacket(true, OPCODE, session.sessionId, data);
         }
     }
 }

FFXIVClassic World Server/Packets/WorldPackets/Send/SessionEndPacket.cs

@@ -31,7 +31,7 @@ namespace FFXIVClassic_World_Server.Packets.WorldPackets.Send
                 }
             }
 
-            return new SubPacket(true, OPCODE, 0, data);
+            return new SubPacket(true, OPCODE, session.sessionId, data);
         }
 
         public static SubPacket BuildPacket(Session session, uint destinationZoneId, string destinationPrivateArea, byte spawnType, float spawnX, float spawnY, float spawnZ, float spawnRotation)
@@ -57,7 +57,7 @@ namespace FFXIVClassic_World_Server.Packets.WorldPackets.Send
                 }
             }
 
-            return new SubPacket(true, OPCODE, 0, data);
+            return new SubPacket(true, OPCODE, session.sessionId, data);
         }
     }
 }