Synfig Animation Studio

I've prepared a test file with 12 nested canvases and a wrap layer over
each. Then over all the layers I put a zoom layer and zoom in though the
time to the deeper canvases.

Everything is fine but when the zoom value reaches 8.75 or bigger then the
navigator and the main window shows an empty canvas.

I've checked that before 8.75 the canvases that have been zoomed in have
been 7 (less than 12).

Rendering the animation also fails (I've rendered from 0f to 6s although
the animation duration is 10s)

Carlos