MARC Import finishes with errors, but no error messages are shown

We are testing honeysuckle release and tried to import a file with ~ 2700 MARC records.
Most work, but there seems to be a problem with some records. The import says "completed with errors", but we can not see any errors.
Looking at the postgres logfile we see some SQL errors:

2020-12-09 12:09:53.432 UTC [70157] bvb_mod_source_record_storage@okapi_modules ERROR: insert or update on table "error_records_lb" violates foreign key constraint "fk_error_records_records"
2020-12-09 12:09:53.432 UTC [70157] bvb_mod_source_record_storage@okapi_modules DETAIL: Key (id)=(f6b2a468-312b-4d39-963d-b87d4a12923e) is not present in table "records_lb".
2020-12-09 12:09:53.432 UTC [70157] bvb_mod_source_record_storage@okapi_modules STATEMENT: COMMIT

It seems, that the problem record is discarded and no error message can be generated.

We use mod-source-record-storage-4.1.3