Forward DisconnectPacket to client in ConfigSessionHandler and TransitionSessionHandler

Co-authored-by: HP888 <hp888@o2.pl>

Author: R00tB33rMan

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/ConfigSessionHandler.java

@@ -170,7 +170,7 @@ public boolean handle(final ResourcePackRequestPacket packet) {
           if (serverConn.getConnection() != null) {
             // We can technically skip these first 2 states, however, for conformity to normal state flow expectations...
             serverConn.getConnection().write(new ResourcePackResponsePacket(
-                    packet.getId(), packet.getHash(), PlayerResourcePackStatusEvent.Status.ACCEPTED));
+                packet.getId(), packet.getHash(), PlayerResourcePackStatusEvent.Status.ACCEPTED));
             serverConn.getConnection().write(new ResourcePackResponsePacket(
                 packet.getId(), packet.getHash(), PlayerResourcePackStatusEvent.Status.DOWNLOADED));
             serverConn.getConnection().write(new ResourcePackResponsePacket(
@@ -255,7 +255,8 @@ public boolean handle(FinishedUpdatePacket packet) {
 
   @Override
   public boolean handle(DisconnectPacket packet) {
-    serverConn.disconnect();
+    MinecraftConnection connection = serverConn.getPlayer().getConnection();
+    connection.closeWith(DisconnectPacket.create(packet.getReason().getComponent(), connection.getProtocolVersion(), connection.getState()));
     resultFuture.complete(ConnectionRequestResults.forDisconnect(packet, serverConn.getServer()));
     return true;
   }

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/TransitionSessionHandler.java

@@ -169,8 +169,8 @@ public boolean handle(JoinGamePacket packet) {
 
   @Override
   public boolean handle(DisconnectPacket packet) {
-    final MinecraftConnection connection = serverConn.ensureConnected();
-    serverConn.disconnect();
+    final MinecraftConnection connection = serverConn.getPlayer().getConnection();
+    connection.closeWith(DisconnectPacket.create(packet.getReason().getComponent(), connection.getProtocolVersion(), connection.getState()));
 
     // If we were in the middle of the Forge handshake, it is not safe to proceed. We must kick
     // the client.