SchedulerBundle: bug(scheduler): consuming tasks in separate processes

Task is running multiple times.

with the following tasks configuration :

scheduler_bundle:
  transport:
    dsn: 'doctrine://default?execution_mode=first_in_first_out'
  tasks:
    foo:
      type: 'command'
      command: 'app:foo'
      description: '3mins task'
      single_run: true
    bar:
      type: 'command'
      command: 'app:bar'
      description: '1mins task'
      single_run: true

and a cron configuration : * * * * * cd /path-to-your-project && php bin/console scheduler:consume >> /dev/null 2>&1

the first scheduler:consume output :

   [OK] Task "bar" succeed. (Duration: 1 min, Memory used: 28.0 MiB)

one minute later second call scheduler:consume output :

   [OK] Task "foo" succeed. (Duration: 3 mins, Memory used: 27.9 MiB)
   [OK] Task "bar" succeed. (Duration: 1 min, Memory used: 28.0 MiB)

we can see that the bar task is executed twice. How can we ensure the uniqueness of tasks.

I hope to be clear enough in my explanation 😄