Publisher available but not converted/stored

[coret]

The following SPARQL query which looks for datasets without a publisher shows 4 datasets - this should not be possible (as this is a mandatory property):

PREFIX dcat: <http://www.w3.org/ns/dcat#>
PREFIX dct:  <http://purl.org/dc/terms/>
SELECT * WHERE {
    ?dataset a dcat:Dataset .
    FILTER NOT EXISTS {
        ?dataset dct:publisher ?publisher .
    }
}

One of the datasets is https://doi.org/10.5281/zenodo.6949127 - this link shows that the dataset is included in the Dataset Register, so it is valid according to our SHACL validation - and this is based on https://gitlab.com/uvacreate/amsterdam-time-machine/infrastructure-pilot/-/raw/main/datasets/huurwaarden1832.jsonld which includes:

publisher: {
  @type: "Organization",
  @id: "https://www.amsterdamtimemachine.nl/",
  name: "Amsterdam Time Machine"
},

[ddeboer]

As you can see in the SHACL, the severity for publisher is warning, not violation, so this is possible.

[coret]

But the issue is that the publisher data isn't stored in the triplestore. Why is this?