ReproducerCommand.php

<?php

// src/AppBundle/Command/ReproducerCommand.php

declare(strict_types=1);

namespace AppBundle\Command;

use EzSystems\EzPlatformPageFieldType\FieldType\LandingPage\Type;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

final class ReproducerCommand extends Command
{
    /** @var \EzSystems\EzPlatformPageFieldType\FieldType\LandingPage\Type */
    private $fieldType;

    public function __construct(Type $fieldType)
    {
        parent::__construct('bug-report');

        $this->fieldType = $fieldType;
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $value = $this->fieldType->getEmptyValue();
        // Number of page zones !== number of zones in layout.
        $value->getPage()->setZones([]);

        $this->fieldType->acceptValue($value);
    }
}

services.yaml

# /app/config/sevices.yml

services:
    _defaults:
        autowire: true
        autoconfigure: true
        public: false

    AppBundle\Command\ReproducerCommand: ~