Unexpected warning

[gtsueng]

Describe the bug
When viewing this schema: https://github.com/BioSchemas/specifications/blob/master/BioChemEntity/jsonld/BioChemEntity_v0.8-DRAFT.jsonld , the DDE warns about being unable to find a class from one of the @context links.

But copying/pasting the link from the warning works just fine.

To Reproduce
Load this schema into the DDE schema viewer: https://github.com/BioSchemas/specifications/blob/master/BioChemEntity/jsonld/BioChemEntity_v0.8-DRAFT.jsonld

Expected behavior
Link works, so why give warning?

Screenshots

Additional context
It's just a warning, so the user can opt. to ignore it. Problem is that users unfamiliar with the DDE will find it hard to ignore and waste time trying to address this.