Image ignoring Flexbox child setting from breakpoint 1280 px and above

Hi there,

I created a container with flexbox vertical setting inside a section with 100 dvh. It contains a heading and an image. The image shoud fill the vertical space and image fit is set to cover.

In the default breakpoint it works fine. But 1280 px and above breakpoint the image ignores the setting.

Who can help? Many thanks in advance.

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