Titles of Wikidata items not visible in other output formats than HTML

[hay]

I'm trying to use Petscan for a reconcilation job. This works fine when giving a list of Wikidata QID's and setting the correct language. The end result is a list of the QID's together with the title in the indicated language:

https://petscan.wmcloud.org/?psid=29328441

However, those titles are not included in any of the machine-readable formats like JSON or CSV. I'm just getting back the QID.

Interestingly enough, the same thing is true for a Pagepile list, when using that export option:

This link includes all the titles when viewing it:
https://pagepile.toolforge.org/api.php?action=get_data&id=61028

But i'm not seeing them when selecting one of the other export options.