Copying and pasting last chord of score corrupts bar

1. Open attached score
2. select the lowest note of the last chord of the left hand
3. hold SHIFT key while selecting the highest note of the same chord
4. COPY
5. select any note of second to last chord of the left hand
6. PASTE

Expected result: last two chords should be the same
Actual result: rythmic mess (see attached result image)

Important: This doesn't happen when drag-selecting the last chord using only the mouse.

System: Windows Vista Home, Nightly c65f00f