Custom report: Start of visit can't have hours + minutes?

I am trying to create a custom report to see when people’s visits start and end.

When I set dimension 1 to “Server time - Hours (Start of visit)”, I am unable to select the corresponding “Minutes” as dimension 2. Instead, I can only select “Local time - Minutes (Start of visit)”. The minutes dimension does exist, it just disappears from the list when I select “server time - hours”.

For “End of visit” this is not a problem. I can make a report for hours and minutes by server time without problems.

Anyone else experiencing this?