Rendering of unsaved entity with comment form ends up in fatal error

Problem/Motivation

The recipe ai_recipe_content_classification uses this module inside an AI Automator. When creating a new entity that has a comment field the exception is thrown:

AssertionError: Cannot load the "node" entity with NULL ID. in assert() (line 266 of /var/www/html/web/core/lib/Drupal/Core/Entity/EntityStorageBase.php).

Full trace:

#0 /var/www/html/web/core/lib/Drupal/Core/Entity/EntityStorageBase.php(266): assert()
#1 /var/www/html/web/core/modules/comment/src/CommentForm.php(101): Drupal\Core\Entity\EntityStorageBase->load()
#2 /var/www/html/web/core/lib/Drupal/Core/Entity/EntityForm.php(108): Drupal\comment\CommentForm->form()
#3 [internal function]: Drupal\Core\Entity\EntityForm->buildForm()
#4 /var/www/html/web/core/lib/Drupal/Core/Form/FormBuilder.php(554): call_user_func_array()
#5 /var/www/html/web/core/lib/Drupal/Core/Form/FormBuilder.php(303): Drupal\Core\Form\FormBuilder->retrieveForm()
#6 /var/www/html/web/core/lib/Drupal/Core/Entity/EntityFormBuilder.php(48): Drupal\Core\Form\FormBuilder->buildForm()
#7 /var/www/html/web/core/modules/comment/src/CommentLazyBuilders.php(117): Drupal\Core\Entity\EntityFormBuilder->getForm()
#8 [internal function]: Drupal\comment\CommentLazyBuilders->renderForm()
#9 /var/www/html/web/core/lib/Drupal/Core/Security/DoTrustedCallbackTrait.php(107): call_user_func_array()
#10 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(910): Drupal\Core\Render\Renderer->doTrustedCallback()
#11 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(417): Drupal\Core\Render\Renderer->doCallback()
#12 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(230): Drupal\Core\Render\Renderer->doRender()
#13 /var/www/html/web/core/lib/Drupal/Core/Template/TwigExtension.php(501): Drupal\Core\Render\Renderer->render()
#14 /var/www/html/web/sites/default/files/php/twig/6a01c01c3b92e_field--comment.html.twig_jhCIdOIEWKN8MUd3-yO7Hi36C/P5BeTkRwurutzDzs3SvIM7ZUrC4mAJpR128N9FB_mPc.php(90): Drupal\Core\Template\TwigExtension->escapeFilter()
#15 /var/www/html/vendor/twig/twig/src/Template.php(402): __TwigTemplate_6aa74ebf53949dd462997db419c9ff46->doDisplay()
#16 /var/www/html/vendor/twig/twig/src/Template.php(386): Twig\Template->yield()
#17 /var/www/html/vendor/twig/twig/src/TemplateWrapper.php(51): Twig\Template->render()
#18 /var/www/html/web/core/lib/Drupal/Core/Template/TwigThemeEngine.php(35): Twig\TemplateWrapper->render()
#19 /var/www/html/web/core/lib/Drupal/Core/Theme/ThemeManager.php(428): Drupal\Core\Template\TwigThemeEngine->renderTemplate()
#20 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(500): Drupal\Core\Theme\ThemeManager->render()
#21 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(513): Drupal\Core\Render\Renderer->doRender()
#22 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(230): Drupal\Core\Render\Renderer->doRender()
#23 /var/www/html/web/core/lib/Drupal/Core/Template/TwigExtension.php(501): Drupal\Core\Render\Renderer->render()
#24 /var/www/html/web/sites/default/files/php/twig/6a01c01c3b92e_node.html.twig_ZrDgkyQoq6_n7OGXwTygSkd8M/_sPNjOhUWUJiGmLvuzLrTc8vhV0_6acJlD8YiQZF_Fg.php(115): Drupal\Core\Template\TwigExtension->escapeFilter()
#25 /var/www/html/vendor/twig/twig/src/Template.php(402): __TwigTemplate_e51ea9e33ab7976f9b606da730009d95->doDisplay()
#26 /var/www/html/vendor/twig/twig/src/Template.php(386): Twig\Template->yield()
#27 /var/www/html/vendor/twig/twig/src/TemplateWrapper.php(51): Twig\Template->render()
#28 /var/www/html/web/core/lib/Drupal/Core/Template/TwigThemeEngine.php(35): Twig\TemplateWrapper->render()
#29 /var/www/html/web/core/lib/Drupal/Core/Theme/ThemeManager.php(428): Drupal\Core\Template\TwigThemeEngine->renderTemplate()
#30 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(500): Drupal\Core\Theme\ThemeManager->render()
#31 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(253): Drupal\Core\Render\Renderer->doRender()
#32 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(143): Drupal\Core\Render\Renderer->doRenderRoot()
#33 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(634): Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}()
#34 [internal function]: Drupal\Core\Render\Renderer::Drupal\Core\Render\{closure}()
#35 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(649): Fiber->resume()
#36 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(142): Drupal\Core\Render\Renderer->executeInRenderContext()
#37 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(152): Drupal\Core\Render\Renderer->renderInIsolation()
#38 /var/www/html/web/modules/contrib/token_entity_render/token_entity_render.module(83): Drupal\Core\Render\Renderer->renderPlain()
#39 [internal function]: token_entity_render_tokens()

The error is caused by comment form that needs the entity id to be rendered, but if it is called on pre save of a new entity, then there is no id yet.

Steps to reproduce

Apply recipe https://www.drupal.org/project/ai_recipe_content_classification . Try to create a new Article (more instructions in the parent issue).

Proposed resolution

Add in_preview property to the entity that is going to be rendered. This is used in several place in core. If this property is there, for example, then comment form is not rendered.

Remaining tasks

User interface changes

API changes

Data model changes