[Inkscape-user] While copying lines the end marks (arrows and others) are not copied

I have some strange experience while copying:

I copied all the elements in a figure and lost the full node marks(?, Knotenmarkierung). This is hopefully not an intended behaviour. I never encountered it.

Select over all layers copy insert

and the arrows etc were gone. I can put them back but I find it strange and maybe a bug. The yellow background is one layer, the arrows are the next and text is the other.

regards Bernhard