Looks like some of the placeholders - {{ routes.search_url }} and { search_term_string } - are printed as-is as part of the URL instead of replacing them with values. Do a search through the theme files and try to find the liquid files that is responsible for rendering this piece of code.
It seems the Rich Snippet has not configured properly. Did you try to use this Schema generator? https://technicalseo.com/tools/schema-markup-generator/
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