I don’t understand the point why multiple choices between pen and mouse are not the same?
On the Ipad or the Windows version with a pen, the selection works the same way:
Several elements can be selected one after the other with the pen, and that’s how it should be.
However, this does not work in the Windows version with mouse!
If you select a second element with the mouse, the first element disappears.
It only works if you press the Shift key at the same time.
I don’t see the point, it’s very, very awkward.