To reproduce in koha-testing-docker (I started it wirh "ktd --es7 up"): 

- Find a record with at least one item
- Click on "Select all" for the items
- Click on "Delete selected items"
- Click the checkbox for "Delete records if no items remain."
- Click on "Delete selected items"
- Click on "View detail of the enqueued job"
- The job failed

Logs: 

==> /var/log/koha/kohadev/worker-output.log <==
{UNKNOWN}: An Elasticsearch error occurred during bulk delete at /kohadevbox/koha/Koha/BackgroundJob/BatchDeleteItem.pm line 153. at /kohadevbox/koha/Koha/BackgroundJob/BatchDeleteItem.pm line 177
[2024/12/18 08:55:39] [WARN] Uncaught exception processing job id=9: encountered object '{UNKNOWN}: An Elasticsearch error occurred during bulk delete at /kohadevbox/koha/Koha/BackgroundJob/BatchDeleteItem.pm line 153. at /kohadevbox/koha/Koha/BackgroundJob/BatchDeleteItem.pm line 177
', but neither allow_blessed, convert_blessed nor allow_tags settings are enabled (or TO_JSON/FREEZE method missing) at /kohadevbox/koha/Koha/BackgroundJob.pm line 270.
 main::catch {...}  /kohadevbox/koha/misc/workers/background_jobs_worker.pl (206)

The job in the database:

MariaDB [koha_kohadev]> select * from background_jobs where id = 9\G
*************************** 1. row ***************************
            id: 9
        status: failed
      progress: 0
          size: 4
borrowernumber: 51
          type: batch_item_record_deletion
         queue: long_tasks
          data: {"delete_biblios":"on","record_ids":["27","24","25","26"]}
       context: {"number":"51","register_name":null,"shibboleth":"0","branch":"CPL","cardnumber":"42","flags":"1","desk_name":null,"register_id":null,"emailaddress":null,"interface":"intranet","desk_id":null,"surname":"koha","id":"koha","firstname":null,"branchname":"Centerville"}
   enqueued_on: 2024-12-18 08:55:39
    started_on: 2024-12-18 08:55:39
      ended_on: NULL
1 row in set (0.000 sec)