Maven Monorepo MRs get superseeded

Hi, we have multiple maven projects in a monorepository. They sometime have the same dependencies. When dependabot starts to create MRs it superseeded all except of the last one.

config:

version: 2
registries:
  maven-mx:
    type: maven-repository
...
updates:
  # Enable version updates for service-1
  - package-ecosystem: "maven"
    directory: "service-1/"
    registries:
      - maven-mx
    schedule:
      interval: "daily"
      time: "23:00"
      timezone: "Europe/Berlin"
    open-pull-requests-limit: 3

  # Enable version updates for service-2
  - package-ecosystem: "maven"
    directory: "service-2/"
    registries:
      - maven-mx
    schedule:
      interval: "daily"
      time: "23:00"
      timezone: "Europe/Berlin"
    open-pull-requests-limit: 3

Mr for service-1

Bump jandex-maven-plugin from 1.1.0 to 1.2.1 in /service-1

This merge request has been superseeded by x (Mr for service-2)

Mr for service-2

Bump jandex-maven-plugin from 1.1.0 to 1.2.1 in /service2