In meta_entity.module, the hook_entity_bundle_field_info() implementation currently type-hints both parameters as strings:
function meta_entity_entity_bundle_field_info(string $entity_type, string $bundle): array {
This strict type hint violates the Drupal core hook expectations. According to the Drupal 11.x API documentation, $bundle can be NULL when Drupal requests field info for all bundles of a given entity type.
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Entity%21...
Update the hook implementation to allow $bundle to be nullable:
function meta_entity_entity_bundle_field_info(string $entity_type, ?string $bundle): array {
Active
1.5
Code
What I read in the link that you've mentioned (this one: https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Entity%21...) is that this hook provides field definitions for a specific bundle within an entity type. And the parameter's documentation is string $bundle: The bundle., not leaving the option for it to be NULL.