Properly use new networks for built-in SSH

config/default.rb

@@ -19,8 +19,8 @@ Vagrant.configure("2") do |config|
 
   # Share SSH locally by default
   config.vm.network :forwarded_port,
-    host: 22,
-    guest: 2222,
+    guest: 22,
+    host: 2222,
     id: "ssh",
     auto_correct: true
 

plugins/kernel_v2/config/vm.rb

@@ -40,7 +40,9 @@ module VagrantPlugins
       # Custom merge method since some keys here are merged differently.
       def merge(other)
         super.tap do |result|
-          result.instance_variable_set(:@__networks, @__networks.merge(other.networks))
+          other_networks = other.instance_variable_get(:@__networks)
+
+          result.instance_variable_set(:@__networks, @__networks.merge(other_networks))
           result.instance_variable_set(:@synced_folders, @synced_folders.merge(other.synced_folders))
           result.instance_variable_set(:@provisioners, @provisioners + other.provisioners)
 
@@ -107,7 +109,7 @@ module VagrantPlugins
         end
 
         # Merge in the latest settings and set the internal state
-        @__networks[id] ||= [type, options]
+        @__networks[id] = [type, options]
       end
 
       # Configures a provider for this VM.