For a long time now the Property:P1368 is not working any more. Please try the Wikidata property example on https://www.wikidata.org/wiki/Property:P1368 or the values of all the items using this property.
If a property is old or defective, it should be repaired or at least signed as defective.
What shall we do?
I think this needs to be discussed on project chat (or perhaps WikiProject authority control?), there’s nothing the dev team can do about this AFAICT.
I think, the dev team can build a script to declare automatically such defective ID properties as dead links anyhow.
The example on the linked property seems to work fine. I don't think we can realistically find the time to write a script at the moment unfortunately.