Really partial references when harvesting

[tjouneau]

What steps does it take to reproduce the issue?

• create a harvesting client for https://repository.ortolang.fr/api/oai and select the "producer:atilf" set and the oai_dc metadata prefix.
• launch harvest
• see the results

What happens?
Results can be seen on our test instance here : https://tested-dataverse5.univ-lorraine.fr/dataverse/ortolang. If the link does not work I attach a picture below for reference.
The references are horribly partial and ugly. Most only have the title right. The date is the date of the harvesting, not the date of publication.
The following request shows a very clean XML output which should not create any problem.
https://repository.ortolang.fr/api/oai/?verb=ListRecords&set=producer:atilf&metadataPrefix=oai_dc
I'm attaching said output here :
repository.ortolang.fr.xml.zip

Which version of Dataverse are you using?
5.10

Any related open or closed issues to this bug report?

Screenshots:

[luddaniel]

Hello everyone, we are working with @tjouneau and the recent in-depth analyses on v6.2+ have allowed us to put our finger on the explanations of why the rendering was questionable and the harvesting partial.

• First, there are many issues with controlled vocabularies and this can be circumvented by activating the allowHarvestingMissingCVV parameter.

• Second, there are data quality anomalies related to the Ortolang data repository, such as the lack of title. Also, the non-management of the dc:contributor tags and the date that does not correspond to dc:date but to dc:datestamp in the headers.

A general work will be done for https://entrepot.recherche.data.gouv.fr/ harvesting and we will contribute all possible improvements to dataverse, in particular the use of the oai_dc and oai_ddi metadata formats. (Already started with #10772 #10837)

@tjouneau I suggest you close this ticket, we will open specific tickets if necessary.