Rebuilding checksums leads to:
Drupal\Core\Entity\EntityStorageException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'default_langcode' cannot be null: INSERT INTO "wd_media_field_data" ("mid", "vid", "bundle", "langcode", "status", "uid", "name", "thumbnail__target_id", "thumbnail__alt", "thumbnail__title", "thumbnail__width", "thumbnail__height", "created", "changed", "default_langcode", "revision_translation_affected", "content_translation_source", "content_translation_outdated", "duplicates_checksum") VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9, :db_insert_placeholder_10, :db_insert_placeholder_11, :db_insert_placeholder_12, :db_insert_placeholder_13, :db_insert_placeholder_14, :db_insert_placeholder_15, :db_insert_placeholder_16, :db_insert_placeholder_17, :db_insert_placeholder_18); Array ( [:db_insert_placeholder_0] => 489 [:db_insert_placeholder_1] => 489 [:db_insert_placeholder_2] => slide [:db_insert_placeholder_3] => en [:db_insert_placeholder_4] => [:db_insert_placeholder_5] => 0 [:db_insert_placeholder_6] => generateImage_AhcIzb.gif [:db_insert_placeholder_7] => 702 [:db_insert_placeholder_8] => Comis luctus nutus occuro quibus suscipere tamen veniam vindico. [:db_insert_placeholder_9] => [:db_insert_placeholder_10] => 3287 [:db_insert_placeholder_11] => 1280 [:db_insert_placeholder_12] => [:db_insert_placeholder_13] => [:db_insert_placeholder_14] => [:db_insert_placeholder_15] => 1 [:db_insert_placeholder_16] => [:db_insert_placeholder_17] => [:db_insert_placeholder_18] => iqWeEOmxAds5g1fbJ9vZzoZW44bNYLWddukt6Sol-lE ) in Drupal\Core\Entity\Sql\SqlContentEntityStorage->save() (Zeile 815 in /web/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php).
I guess the reason is within one of the media files, but that shouldn't break rebuilding checksums.
Instead the iteration should be skipped and an error should be logged.
Active
2.0
Code
This was existing dummy content generated by devel_generate in Drupal 7 and migrated into Drupal 10. So won't be that easy to reproduce, perhaps we can solve this from the code side?
Just ran into this again in a different project. wd_ is our table prefix.