Playground error or schema.org error?

Just wondering:

https://tinyurl.com/y45ycru2 <https://tinyurl.com/y45ycru2>

reports an error on playground on the context line referring to 'schema.org <http://schema.org/>' (the JSON-LD snippet comes from the draft).

I *suspect* this a schema.org <http://schema.org/> error; if I say:

curl --header "Accept: application/json" https://schema.org <https://schema.org/>

I would expect to receive a json-ld file, but I get an HTML instead…

Am I misreading something? Maybe something went wrong when the new version of schema.org <http://schema.org/> was installed a few days ago?

Ivan

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Ivan Herman, W3C 
Publishing@W3C Technical Lead
Home: http://www.w3.org/People/Ivan/ <http://www.w3.org/People/Ivan/>
mobile: +31-641044153
ORCID ID: https://orcid.org/0000-0003-0782-2704 <https://orcid.org/0000-0003-0782-2704>