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The last breadcrumb on a search results page is not a link, but instead is just plaintext of the search keywords. The adaptive_preprocess_breadcrumb function adds RDF markup at the third character of the breadcrumb. This normally works fine for breadcrumbs since the first three characters are "< a ", but for breadcrumbs that aren't links (search keywords), it adds it into the keyword itself.
This is what I get when searching for "engineering" on my dev site.