Missing `@odata.id` property not flagged as error

[jautor]

An implementation that had mistakenly placed @odata.id within the Links object did not have this flagged as an error. As an annotation, I wouldn't expect the copy within Links to be marked as an error, but the lack of the annotation property at the root of the resource should certainly be flagged as an error.

Will reproduce with a simple mockup to make sure this is a general case and not something weird.