<?php

  $lastInstalledSchemaRepo = \Drupal::service('entity.last_installed_schema.repository');
  
  $entityTypes = ['node', 'block_content', 'taxonomy_term', 'user'];
  foreach ($entityTypes as $typeId) {
    echo "INSPECTING LAST INSTALLED SCHEMA DEFINITION FOR $typeId...\n";
    $bcDefn = $lastInstalledSchemaRepo->getLastInstalledDefinition('block_content');

    $refl = new ReflectionObject($bcDefn);
    $revision_metadata_keys = $refl->getProperty('revision_metadata_keys');
    $revision_metadata_keys->setAccessible(TRUE);

    var_dump($revision_metadata_keys->getValue($bcDefn));
    var_dump($bcDefn->getRevisionMetadataKeys());
  }