Bayern Munich's Serge Gnabry in action against FC Cologne at the Allianz Arena, Munich August 22, 2021. — Reuters pic

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BERLIN, Aug 23 — Serge Gnabry struck twice as Bayern Munich picked up their first Bundesliga win this season with a 3-2 victory over Cologne Sunday, but Julian Nagelsmann criticised a “wild” display from the defending champions.