It matches the pattern because 1. its "root" node is a verb; 2. the verb has an "aux" child; 3. the verb is linked with another clause via a "conj" relation; 4. the other clause is headed by an adjective and has a "cop" (copula) dependent; 5. both clauses contain a "nsubj" (subject) and an "advmod" (adverbial modifier).
we currently do not check prepositions in English; instead, we manually fix sentences where prepositions are not compatible.