grumphp: Fatal error on first composer install

Q	A
Version	0.14
Bug?	yes
New feature?	no
Question?	no
Documentation?	no
Related tickets	comma-separated list of related tickets

When running composer install in a clean repository (no vendor folder exists yet), I’m getting this error:

Fatal error: Class 'Doctrine\Common\Collections\ArrayCollection' not found in /Users/rasta/DEV/BetterSerializer/vendor/phpro/grumphp/src/Collection/ProcessArgumentsCollection.php on line 8

This happens when running the GrumPHP\\Composer\\DevelopmentIntegrator::integrate composer post install command for the first time. When running composer install for the second time, the error isn’t there anymore. Which is kind of ok, but this thing breaks my Travis build.

I’m using the composer --no-scripts flag as a workaround for now.

My configuration

parameters:
    git_dir: .
    bin_dir: vendor/bin
    process_timeout: 600
    tasks:
      phpcs:
        standard: PSR2
        tab_width: 4
        whitelist_patterns: []
        encoding: ~
        ignore_patterns: []
        sniffs: []
        triggered_by: [php]
      phpcsfixer2:
        allow_risky: true
        cache_file: .php_cs.cache
        config: .php_cs
        using_cache: true
        config_contains_finder: false
        verbose: true
        diff: false
        triggered_by: [php]
      phplint: ~
      phpmd:
        exclude: []
        ruleset: ['dev/phpmd.ruleset.xml']
        triggered_by: [php]
      phpparser: ~
      phpstan:
        autoload_file: ~
        configuration: dev/phpstan.neon
        level: 7
        triggered_by: [php]
      phpunit: ~
      infection:
        threads: 2
        test_framework: phpunit
        only_covered: true
        configuration: infection.json
        min_msi: ~
        min_covered_msi: ~
        mutators: []
        triggered_by: [php]
      phpversion: ~
      securitychecker: ~
      shell: ~

My composer.json file (minimised to the bare minimum to reproduced the error):

{
    "name": "whatever/whatever",
    "description": "whatever",
    "type": "library",
    "license": "MIT",
    "minimum-stability": "dev",
    "require": {
        "php": "^7.2"
    },
    "require-dev": {
        "doctrine/collections": "^1.5",
        "phpro/grumphp": "^v0.14"
    },

    "autoload": {
        "psr-4": {
            "BetterSerializer\\": "src/BetterSerializer/"
        }
    },

    "autoload-dev": {
        "psr-4": {
            "BetterSerializer\\": "tests/BetterSerializer/",
            "Integration\\": "tests/Integration/"
        }
    },

    "config": {
        "platform": {
            "php": "7.2"
        },
        "sort-packages": true
    }
}

Steps to reproduce:

# Generate empty folder
git clone https://github.com/better-serializer/better-serializer.git
cd better-serializer
git checkout faster_than_reflection
composer install -o --no-interaction  

Result:

Writing lock file
Generating optimized autoload files

Fatal error: Class 'Doctrine\Common\Collections\ArrayCollection' not found in /Users/rasta/DEV/BetterSerializer/vendor/phpro/grumphp/src/Collection/ProcessArgumentsCollection.php on line 8