[BUG] Can not depends_on containers that start with x-

[bspot]

Description

When a depends_on contains a container whose name starts with x-, docker compose will fail complaining that the depended on service does not exist.

Steps To Reproduce

services:
    x-foo:
        image: "bash"
        command: "sleep 60"
    bar:
        image: "bash"
        command: "sleep 60"
        depends_on:
          - "x-foo"

Output of docker compose up:

service "bar" depends on undefined service "#extensions": invalid compose project

The same happens when using the long form of depends_on.

Compose Version

Docker Compose version v2.29.7

Same happens with

Docker Compose version v2.28.1

Docker Environment

Client: Docker Engine - Community
 Version:    27.3.1
 Context:    default
 Debug Mode: false
 Plugins:
  compose: Docker Compose (Docker Inc.)
    Version:  v2.29.7
    Path:     /usr/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 14
  Running: 14
  Paused: 0
  Stopped: 0
 Images: 126
 Server Version: 27.3.1
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 Swarm: active
  NodeID: jsm6bxts3k05x0xelkc5k17ov
  Is Manager: true
  ClusterID: uaci6jvh4qlw9y3qedpv7twbu
  Managers: 1
  Nodes: 1
  Default Address Pool: 10.0.0.0/8  
  SubnetSize: 24
  Data Path Port: 4789
  Orchestration:
   Task History Retention Limit: 5
  Raft:
   Snapshot Interval: 10000
   Number of Old Snapshots to Retain: 0
   Heartbeat Tick: 1
   Election Tick: 10
  Dispatcher:
   Heartbeat Period: 5 seconds
  CA Configuration:
   Expiry Duration: 3 months
   Force Rotate: 0
  Autolock Managers: false
  Root Rotation In Progress: false
  Node Address: 10.10.1.2
  Manager Addresses:
   10.10.1.2:2377
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 7f7fdf5fed64eb6a7caf99b3e12efcf9d60e311c
 runc version: v1.1.14-0-g2c9f560
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 5.10.0-16-amd64
 Operating System: Debian GNU/Linux 11 (bullseye)
 OSType: linux
 Architecture: x86_64
 CPUs: 3
 Total Memory: 3.745GiB
 Name: delta-1
 ID: a784c1a8-3135-4649-91a5-d65681f05f3b
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

Anything else?

I assume that has something to do with extension properties?