[Cerio]

My bad, I was testing the feature using incorrectly formatted file:

{start_of_grid 4x1}
| . |
{end_of_grid}
{start_of_grid 4x8}
| A . . . . . . . | D . . . . . . . | A . . . . . . . | D . . . . . . . |
{end_of_grid}

{comment: A}
{start_of_grid 4x8}
| A  . . . . . . .  | D  . . . . . . . | F#m . . . . . . . | E . . . . . . . |
| D  . . E . . . Dm | .  . . G . . . . | A  . . . . . . . | . . . . . . . . |
| D  . . . . . . .  | F#m . . . . . . . | E  . . . . . . . | D . . E . . . . |
| Dm . . G . . . .  | A  . . . . . . . |
{end_of_grid}

Thanks for providing an example (and sorry for not providing mine)