Hi!
Can you try again please? And in an in-cognito window? I just tried it and it works for me: https://test.wikidata.org/wiki/Q649 We've had some issues with local store though.
Weird, does work for me incognito but not when logged in.
The datatype changes but the value type stays string. So depending on what they use they might need to be adapted.
RDF export seems to be fine, except that we need to update OWL and docs for new types, I'll check pywikibot a bit later.