Set Z value in LAS file

Hi,

I have a LAS file already normalized, ground z value = 0, and other class z = height above ground. I need to set the z value to “0” to building class. I try this workflow and it’s seem to work but when I check the LAS writer, build and ground have the 8.847607091e-10 z value.

I dont know why this, but when I check property in FME, I realize that z value it’s different.

In my normalized LAS the z value

But in the output LAS I get this in z value

I tryied with PointCluidExpressionEvaluator instead remove and adder component but I get the same in Z value

Any idea why this happens?