Block.parent loss on serialization during snapshot creation

[tdumalin]

Environment

Sonata packages

show

$ composer show --latest 'sonata-project/*'
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- patch or minor release available - update recommended
- major release available - update possible
- up to date version

Direct dependencies required in composer.json:
sonata-project/admin-bundle              4.35.4 4.35.4 The missing Symfony Admin Generator
sonata-project/doctrine-orm-admin-bundle 4.18.0 4.18.0 Integrate Doctrine ORM into the SonataAdminBundle
sonata-project/media-bundle              4.15.0 4.15.0 Symfony SonataMediaBundle
sonata-project/page-bundle               4.8.0  4.8.0  This bundle provides a Site and Page management through container and block services

Transitive dependencies not required in composer.json:
sonata-project/block-bundle              5.1.2  5.1.2  Symfony SonataBlockBundle
sonata-project/doctrine-extensions       2.5.0  2.5.0  Doctrine2 behavioral extensions
sonata-project/exporter                  3.3.1  3.3.1  Lightweight Exporter library
sonata-project/form-extensions           2.4.1  2.4.1  Symfony form extensions
sonata-project/seo-bundle                3.8.0  3.8.0  Symfony SonataSeoBundle
sonata-project/twig-extensions           2.5.0  2.5.0  Sonata twig extensions

Symfony packages

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$ composer show --latest 'symfony/*'
Color legend:                                                                       
- patch or minor release available - update recommended
- major release available - update possible
- up to date version

Direct dependencies required in composer.json:
symfony/asset                      7.2.0  7.2.0  Manages URL generation and versioning of web assets such as CSS stylesheets, JavaScript files and image ...
symfony/console                    7.2.1  7.2.1  Eases the creation of beautiful and testable command line interfaces
symfony/debug-bundle               7.2.0  7.2.0  Provides a tight integration of the Symfony VarDumper component and the ServerLogCommand from MonologBri...
symfony/dotenv                     7.2.0  7.2.0  Registers environment variables from a .env file
symfony/flex                       2.4.7  2.4.7  Composer plugin for Symfony
symfony/form                       7.2.3  7.2.3  Allows to easily create, process and reuse HTML forms
symfony/framework-bundle           7.2.3  7.2.3  Provides a tight integration between Symfony components and the Symfony full-stack framework
symfony/mailer                     7.2.3  7.2.3  Helps sending emails
symfony/maker-bundle               1.62.1 1.62.1 Symfony Maker helps you create empty commands, controllers, form classes, tests and more so you can forg...
symfony/monolog-bundle             3.10.0 3.10.0 Symfony MonologBundle
symfony/runtime                    7.2.3  7.2.3  Enables decoupling PHP applications from global state
symfony/security-csrf              7.2.3  7.2.3  Symfony Security Component - CSRF Library
symfony/stimulus-bundle            2.23.0 2.23.0 Integration with your Symfony app & Stimulus!
symfony/stopwatch                  7.2.2  7.2.2  Provides a way to profile code
symfony/twig-bundle                7.2.0  7.2.0  Provides a tight integration of Twig into the Symfony full-stack framework
symfony/ux-icons                   2.23.0 2.23.0 Renders local and remote SVG icons in your Twig templates.
symfony/ux-live-component          2.23.0 2.23.0 Live components for Symfony
symfony/ux-twig-component          2.23.0 2.23.0 Twig components for Symfony
symfony/web-profiler-bundle        7.2.3  7.2.3  Provides a development tool that gives detailed information about the execution of any request
symfony/webpack-encore-bundle      2.2.0  2.2.0  Integration of your Symfony app with Webpack Encore
symfony/yaml                       7.2.3  7.2.3  Loads and dumps YAML files

Transitive dependencies not required in composer.json:
symfony/cache                      7.2.3  7.2.3  Provides extended PSR-6, PSR-16 (and tags) implementations
symfony/cache-contracts            3.5.1  3.5.1  Generic abstractions related to caching
symfony/clock                      7.2.0  7.2.0  Decouples applications from the system clock
symfony/config                     7.2.3  7.2.3  Helps you find, load, combine, autofill and validate configuration values of any kind
symfony/dependency-injection       7.2.3  7.2.3  Allows you to standardize and centralize the way objects are constructed in your application
symfony/deprecation-contracts      3.5.1  3.5.1  A generic function and convention to trigger deprecation notices
symfony/doctrine-bridge            7.2.3  7.2.3  Provides integration for Doctrine with various Symfony components
symfony/error-handler              7.2.3  7.2.3  Provides tools to manage errors and ease debugging PHP code
symfony/event-dispatcher           7.2.0  7.2.0  Provides tools that allow your application components to communicate with each other by dispatching even...
symfony/event-dispatcher-contracts 3.5.1  3.5.1  Generic abstractions related to dispatching event
symfony/expression-language        7.2.0  7.2.0  Provides an engine that can compile and evaluate expressions
symfony/filesystem                 7.2.0  7.2.0  Provides basic utilities for the filesystem
symfony/finder                     7.2.2  7.2.2  Finds files and directories via an intuitive fluent interface
symfony/http-client                7.2.3  7.2.3  Provides powerful methods to fetch HTTP resources synchronously or asynchronously
symfony/http-client-contracts      3.5.2  3.5.2  Generic abstractions related to HTTP clients
symfony/http-foundation            7.2.3  7.2.3  Defines an object-oriented layer for the HTTP specification
symfony/http-kernel                7.2.3  7.2.3  Provides a structured process for converting a Request into a Response
symfony/intl                       7.2.0  7.2.0  Provides access to the localization data of the ICU library
symfony/mime                       7.2.3  7.2.3  Allows manipulating MIME messages
symfony/monolog-bridge             7.2.0  7.2.0  Provides integration for Monolog with various Symfony components
symfony/options-resolver           7.2.0  7.2.0  Provides an improved replacement for the array_replace PHP function
symfony/password-hasher            7.2.0  7.2.0  Provides password hashing utilities
symfony/polyfill-intl-grapheme     1.31.0 1.31.0 Symfony polyfill for intl's grapheme_* functions
symfony/polyfill-intl-icu          1.31.0 1.31.0 Symfony polyfill for intl's ICU-related data and classes
symfony/polyfill-intl-idn          1.31.0 1.31.0 Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions
symfony/polyfill-intl-normalizer   1.31.0 1.31.0 Symfony polyfill for intl's Normalizer class and related functions
symfony/polyfill-mbstring          1.31.0 1.31.0 Symfony polyfill for the Mbstring extension
symfony/polyfill-php83             1.31.0 1.31.0 Symfony polyfill backporting some PHP 8.3+ features to lower PHP versions
symfony/process                    7.2.0  7.2.0  Executes commands in sub-processes
symfony/property-access            7.2.3  7.2.3  Provides functions to read and write from/to an object or array using a simple string notation
symfony/property-info              7.2.3  7.2.3  Extracts information about PHP class' properties using metadata of popular sources
symfony/routing                    7.2.3  7.2.3  Maps an HTTP request to a set of configuration variables
symfony/security-acl               3.3.4  3.3.4  Symfony Security Component - ACL (Access Control List)
symfony/security-bundle            7.2.3  7.2.3  Provides a tight integration of the Security component into the Symfony full-stack framework
symfony/security-core              7.2.3  7.2.3  Symfony Security Component - Core Library
symfony/security-http              7.2.3  7.2.3  Symfony Security Component - HTTP Integration
symfony/serializer                 7.2.3  7.2.3  Handles serializing and deserializing data structures, including object graphs, into array structures or...
symfony/service-contracts          3.5.1  3.5.1  Generic abstractions related to writing services
symfony/string                     7.2.0  7.2.0  Provides an object-oriented API to strings and deals with bytes, UTF-8 code points and grapheme clusters...
symfony/translation                7.2.2  7.2.2  Provides tools to internationalize your application
symfony/translation-contracts      3.5.1  3.5.1  Generic abstractions related to translation
symfony/twig-bridge                7.2.2  7.2.2  Provides integration for Twig with various Symfony components
symfony/type-info                  7.2.2  7.2.2  Extracts PHP types information.
symfony/validator                  7.2.3  7.2.3  Provides tools to validate values
symfony/var-dumper                 7.2.3  7.2.3  Provides mechanisms for walking through any arbitrary PHP variable
symfony/var-exporter               7.2.0  7.2.0  Allows exporting any serializable PHP data structure to plain PHP code

PHP version

$ php -v
PHP 8.3.16 (cli) (built: Jan 17 2025 01:31:09) (ZTS)
Copyright (c) The PHP Group
Zend Engine v4.3.16, Copyright (c) Zend Technologies
    with Zend OPcache v8.3.16, Copyright (c), by Zend Technologies
    with Xdebug v3.4.1, Copyright (c) 2002-2025, by Derick Rethans

Subject

The Sonata\PageBundle\Entity\Transformer now use serializer to create a snapshot, all objects are ignored and so the block page is not serialized:
Ex:

    0 => array:8 [▼
      "id" => 39
      "blocks" => []
      "settings" => array:1 [▼
        "template" => "block/breadcrumb.html.twig"
      ]
      "enabled" => true
      "position" => 0
      "created_at" => "1740055293"
      "updated_at" => "1740055309"
      "type" => "App\Block\BreadcrumbBlock"
     // <---- no page key defined
    ]

Then when the block is normalized in the BlockContextInterface the page are null

<?php

namespace App\Block;
// ....

class BreadcrumbBlock extends AbstractBlockService implements EditableBlockService
{
   //....

    public function execute(BlockContextInterface $blockContext, ?Response $response = null): Response
    {
           // when logged as a page editor everything works normally because it use the proxy system, but as anonymous user this throw an error ""
           $pageId = $blockContext->getBlock()->getPage()->getId();
    }
}

Minimal repository with the bug

Steps to reproduce

Try to access blockContext.block.page as an anonymous user

Expected results

the block page

Actual results

"Call to a member function getId() on null"