I can speak of experience of my 722.4.

the cold marking of 30C is very vague, doesnt make sense to me. because the manual tells to fill it 11mm lower than the 30C mark when cold and engine started.

My car's dipstick has a curl on the end and makes itself a pointer mark - I put the ATF level right at the edge where it becomes like a pointer arrow. After a 60 mile run to work I checked the ATF level while engine was at 90C and it was exactly at the top mark of the 80C. Shifts perfectly etc.

I believe the 722.3 dead cold fill is more like 5 or 6 mm lower than the 30C mark.

I checked my 722.6 level cold and put it at the cold mark, after driving similar mileage I checked and it was between the 80C marks

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)