Extended slur from grace note
Steps to reproduce:
1. Open attached score.
2. Double click slur.
3. Shift - right
Result: Slur extended onto the chordrest at second beat.
Upon save and reload, the slur is at the previous position.
The extend action cannot be undone. Tried with Ctrl+Z and Shift+Left.
Expected: No change. A slur should end at the chord rest right after the grace note.