Tread and riser labelling: bug?

[alemanda]

Hi,
I set my classification and properties for treads and risers of a stair in the project.
I tried to label both the treads and risers using autotext label and recall one of the property and I got the following: for the home story of the stair everything is ok while in the other floors where the stair is represented I didn't get the property but just the property name as the value is empty ...