Mouse entered notes do not pick up pending slurs
When entering notes with the keyboard you can mark one as the first of a slur by pressing "s". All subsequent notes entered are slurred together until you stop slurring by pressing "s" again.
When entering notes with the mouse you can press "s" as well; this starts the slur at the last entered note and the end is at the rest to follow. But if you replace the rest by a note with mouse input the slur dosn't change to end at this note. The new note doesn't pick up the slur as with keybord input.