Auditing does not work for Couchbase records

Auditing fields are not saved for Couchbase entities declared as Java records.

For example:

@Document
record AuditedRecord(
        @Id String id,
        @CreatedDate Instant createdDate,
        @LastModifiedDate Instant lastModifiedDate) {}

When saving a new record with Couchbase auditing enabled:

var saved = repository.save(new AuditedRecord(null, null, null));

the record read back from Couchbase has null audit fields:

var found = repository.findById(saved.id()).orElseThrow();

assertThat(found.createdDate()).isNotNull(); // fails
assertThat(found.lastModifiedDate()).isNotNull(); // fails 

Reproduce the issue with the Java record, @CreatedDate and @LastModifiedDate fields, and the repository.save/findById flow shown here. Trace the Couchbase auditing and record-mapping entry points to determine why the fields remain null. Done means both audit fields are populated after saving and remain non-null when the record is read back.