"Where it use to say just "itemReviewed" - now it says "itemReviewed (if review is not a Nested Review)." Under that, Google updated this line to say, "The item that is being reviewed. However, if the review is nested into another schema.org type using the review property, omit the itemReviewed property (we assume the parent item is the reviewed item).""
"The itemReviewed.name added to it "or parent item name in Nested Review." This line now says "itemReviewed (if aggregate rating is not a Nested Aggregate Rating)" This too, "itemReviewed.name or parent item name in Nested Aggregate Rating." This use to read "The name of the item that is being reviewed. If the review is nested into another schema.org type using the review property, you still need to provide the name of the thing that is being reviewed. For example.""
Documentation now instructs site owners to avoid using multiple ways of indicating what is being reviewed to prevent ambiguity. The itemReviewed property must be omitted when a review is nested into another schema.org type using the review property, since the parent item is assumed to be the reviewed item. The itemReviewed.name may refer to the parent item name in a nested review. Similar clarifications apply for aggregateRating: itemReviewed and itemReviewed.name guidance now specify when to omit or reference parent items for nested aggregate ratings. The changes aim to improve interpretation of review and aggregate rating structured data.
Read at Search Engine Roundtable
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