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Glad you found the issue - not all similar buzzers are sensitive to polarity, some work just fine either way.Though, the datasheet does have it multiple times: (+) and (-), and "POLARITY PAD(+)", "POLARITY PAD(-)".
Another thing to note is the electromechanical buzzers require a freewheeling diode, because they generate back-EMF when the current in the coil is interrupted whilst the transistor type do not, as they have one built-in.