Docker stack deploy with network host fails yaml validation on docker for windows

Description

I am trying to deploy a stack with a service using network host because this service needs to do a multicast.

As stated in the docs (https://docs.docker.com/compose/compose-file/#host-or-none) I declared an external netowrk called host and use that network in my service. This works perfectly fine on linux with docker 17.12.0-ce (or 17.12.1-ce or any other version I tested) however on docker for widnows with version 17.12.0 I get:
network "host" is declared as external, but it is not in the right scope: "local" instead of "swarm"

Steps to reproduce the issue:

1. Create a stack with network

networks:
  hostnet:
    external:
      name: host

2. Declare a service using said network:

  example-service:
    image: hello-world
    networks:
      - hostnet

3. deploy the stack

Describe the results you received:
network "host" is declared as external, but it is not in the right scope: "local" instead of "swarm"

Describe the results you expected:
Stack is successfully deployed

Additional information you deem important (e.g. issue happens only occasionally):
When calling docker stack deploy from within a container running 17.10 which has the docker socket mounted the behaviour is as desired.
Output of docker version:

Version:       17.12.0-ce                                                                                               API version:   1.35                                                                                                     Go version:    go1.9.2                                                                                                  Git commit:    c97c6d6                                                                                                  Built: Wed Dec 27 20:05:22 2017                                                                                         OS/Arch:       windows/amd64                                                                                                                                                                                                                   Server:                                                                                                                  Engine:                                                                                                                  Version:      17.12.0-ce                                                                                                API version:  1.35 (minimum version 1.12)                                                                               Go version:   go1.9.2                                                                                                   Git commit:   c97c6d6                                                                                                   Built:        Wed Dec 27 20:12:29 2017                                                                                  OS/Arch:      linux/amd64                                                                                               Experimental: false   

Output of docker info:

Containers: 43                                                                                                           Running: 22                                                                                                             Paused: 0                                                                                                               Stopped: 21                                                                                                            Images: 20                                                                                                              Server Version: 17.12.0-ce                                                                                              Storage Driver: overlay2                                                                                                 Backing Filesystem: extfs                                                                                               Supports d_type: true                                                                                                   Native Overlay Diff: true                                                                                              Logging Driver: json-file                                                                                               Cgroup Driver: cgroupfs                                                                                                 Plugins:                                                                                                                 Volume: local                                                                                                           Network: bridge host macvlan null overlay                                                                               Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog                                          Swarm: active                                                                                                            NodeID: lcayhpu052oheu67v8z4kq5z9                                                                                       Is Manager: true                                                                                                        ClusterID: quho6g21euunnxpkcqc41bpbj                                                                                    Managers: 1                                                                                                             Nodes: 1                                                                                                                Orchestration:                                                                                                           Task History Retention Limit: 5                                                                                        Raft:                                                                                                                    Snapshot Interval: 10000                                                                                                Number of Old Snapshots to Retain: 0                                                                                    Heartbeat Tick: 1                                                                                                       Election Tick: 3                                                                                                       Dispatcher:                                                                                                              Heartbeat Period: 5 seconds                                                                                            CA Configuration:                                                                                                        Expiry Duration: 3 months                                                                                               Force Rotate: 0                                                                                                        Autolock Managers: false                                                                                                Root Rotation In Progress: false                                                                                        Node Address: 192.168.65.3                                                                                              Manager Addresses:                                                                                                       192.168.65.3:2377                                                                                                     Runtimes: runc                                                                                                          Default Runtime: runc                                                                                                   Init Binary: docker-init                                                                                                containerd version: 89623f28b87a6004d4b785663257362d1658a729                                                            runc version: b2567b37d7b75eb4cf325b77297b140ea686ce8f                                                                  init version: 949e6fa                                                                                                   Security Options:                                                                                                        seccomp                                                                                                                  Profile: default                                                                                                      Kernel Version: 4.9.60-linuxkit-aufs                                                                                    Operating System: Docker for Windows                                                                                    OSType: linux                                                                                                           Architecture: x86_64                                                                                                    CPUs: 2                                                                                                                 Total Memory: 1.934GiB                                                                                                  Name: linuxkit-00155d087104                                                                                             ID: YSPZ:2MRF:HAXW:KTZA:WCKX:NSTV:B4G3:CMC2:ZIH6:WA4B:K5DE:TFYL                                                         Docker Root Dir: /var/lib/docker                                                                                        Debug Mode (client): false                                                                                              Debug Mode (server): true                                                                                                File Descriptors: 171                                                                                                   Goroutines: 346                                                                                                         System Time: 2018-03-19T15:15:38.913833Z                                                                                EventsListeners: 16                                                                                                    Registry: https://index.docker.io/v1/                                                                                   Labels:                                                                                                                 Experimental: false                                                                                                     Insecure Registries:                                                                                                     127.0.0.0/8                                                                                                            Live Restore Enabled: false 

Start by reproducing the provided docker stack deploy case with the external host network on Docker for Windows and Linux, then trace where the network scope is validated. Done means the supplied stack deploys successfully on the affected platform without the local-versus-swarm scope error.