PHP 8.5 Deprecation Notice: Using null as an array offset is deprecated in DockerComposeConfigurator.php

[Mynyx]

When installing a new Symfony 8.0 webapp with Composer under PHP 8.5, a depreaction notice is shown:

composer create-project symfony/skeleton:"8.0.*" my_project_directory
cd my_project_directory
composer require webapp

...
Symfony operations: 22 recipes (028901ec6b3613f936547ee3acc5f42f)
  - Configuring symfony/webapp-pack (>=1.0): From github.com/symfony/recipes:main
  - Configuring doctrine/deprecations (>=1.0): From github.com/symfony/recipes:main
  - Configuring doctrine/doctrine-bundle (>=3.0): From github.com/symfony/recipes:main
  -  WARNING  doctrine/doctrine-bundle (>=3.0): From github.com/symfony/recipes:main
    The recipe for this package contains some Docker configuration.

    This may create/update compose.yaml or update Dockerfile (if it exists).

    Do you want to include Docker configuration from recipes?
    [y] Yes
    [n] No
    [p] Yes permanently, never ask again for this project
    [x] No permanently, never ask again for this project
    (defaults to y):
Deprecation Notice: Using null as an array offset is deprecated, use an empty string instead in /.../my_project_directory/vendor/symfony/flex/src/Configurator/DockerComposeConfigurator.php:288
...