Is that normal or what is the fix?

It does sounds like a one lifter until it fills with oil. The engine is smooth and does not miss when the noise happens. It is only on start up, about 45% of the time mostly when the engine is cold. I haven't heard it at all in a week.

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2002 X5 4.4i Sport Wheels
2014 X5 35i M Appearance & suspension package
1995 Porsche 993
1972 Porsche 914-6
2020 GLE 450 Twin Turbo
2019 Alfa Stelvio 500hp Quadrifogilo
Many motorcycles