QGIS » QGIS Application

It is currently impossible (QGIS 2.8.2) to use the new advanced digitizing tool to digitize a normal square. I'm using the following workflow:

1. Create a new layer (shapefile or virtual layer)
2. Activate advanced digitizing
3. Create the first vertex: press x, write 0, lock with Enter, then press y, write 0, lock with Enter, click to create the vertex
4. Create the second vertex: press x, write 1, lock with Enter, then press y, write 0, lock with Enter, click to create the vertex
5. Try to create the third vertex: press x, write 1, lock with Enter, then press y, write 1, lock with Enter, click to create the vertex

The third vertex is always wrongly created at coordinates (1,0) instead of (1,1), which creates a geometry error since 2 vertices are identical.