workflow_buttons.module's workflow_buttons_entity_view() has an assertion for \Drupal::service('entity.form_builder'); to be an instance of Drupal\Core\Form\FormBuilder, but that service instead returns an instance of Drupal\Core\Entity\EntityFormBuilder, causing an error.
Upgrade to the latest dev release and try visiting a page that calls workflow_buttons_entity_view(). Page load will fail with error:
AssertionError: assert($form_builder instanceof FormBuilder) in assert() (line 117 of /var/www/html/docroot/sites/default/modules/contrib/workflow_buttons/workflow_buttons.module).
Update the assertion to instead expect an instance of Drupal\Core\Entity\EntityFormBuilderInterface.
See also 📌 Automated Drupal 11 compatibility fixes for workflow_buttons Active MR #13 which considers this new to Drupal 11, though it is present in Drupal 10 as well. Propose making the same changes as in this commit, but separate from Drupal 11 readiness topic.
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Please also credit @ultrabob for also proposing this change in 📌 Automated Drupal 11 compatibility fixes for workflow_buttons Active , although the problem exists in Drupal 10 with the latest dev release of this module.