Rattling noise at over 2k rpm

[Seco]

Hi guys. Maybe someone can help as my local MB garage couldn't. I own a b220d 2020 and the car makes a rattling noise when cold and rpm goes over 2k. As soon as the temp goes up and the engine is warm rattling stops. Any ideas? Thank you in advance

 

[Seco]

Hi guys. Maybe someone can help as my local MB garage couldn't. I own a b220d 2020 and the car makes a rattling noise when cold and rpm goes over 2k. As soon as the temp goes up and the engine is warm rattling stops. Any ideas? Thank you in advance

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[Seco]

Rattling noise happens its hard on passenger side only when car is cold and underload. When shifting happens over 2k rpm. As soon as the engine warms up it disappears. I tried to rev the engine when cold but parked and there is no rattling.