I've also experienced a selection created by a click at a starting point
followed by shift+click at the ending point to not be copied. When
pasting, the previous selection created by dragging over the desired
text is still in the clipboard and is pasted instead of the new
selection.
I've noticed t
I've also noted this behavior with lxterminal and xfce4-terminal.
I agree that there is some connection between this bug and bug #57568.
If you drag to make a selection and then expand the selection using
shift+left click, when you copy and paste you get only the part that was
selected using the d