Bug: vertical alignment is wrong

[EpsilonD3lta]

Consider system

M:4/4
L:1/4
V:1
V:2 clef=bass
K:C
[V:1] z1/2 [CD]1/2 z z z1/2 z1/2  |
[V:2] [E,A,C]1/2 [E,A,C] z [G,A,] [G,A,]1/2 |

Result:

It seems that the alignments do not respect notes/rests lengths correctly