JSON-LD block missing @type
What this means
A JSON-LD block declares no @type anywhere in its tree and is not a pure @id reference, so search engines cannot interpret it at all. Entities inside @graph or a top-level array do count.
How to fix it
Give every JSON-LD entity an @type naming the schema.org type it describes.
Fix effort
This check needs review: the change can be drafted for you, but a person has to approve the wording or choose the target before it ships.
Authoritative source
https://developers.google.com/search/docs/appearance/structured-data/intro-structured-data
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