using 18.0.325
I have a curve node,
then facet, a reverse
and attribute wrangle with expressions of:
@P.x = rint(@P.x/2)*2;
@P.z = rint(@P.z/2)*2;
this is to keep polygon in 2x2 grid

after attribute wrangle the polygon disappears, its there on reverse node.
follow Kenny Lamers Guard Tower tutorial. he is using 16.5

Without a hip, hard to say. What are the dimensions of the line before the wrangle?

If the points are less than one unit, all your points will end up as 0 because rint()bring the values to 0(nearest whole number, e.g. 0.9 becomes 0.45, and that is closer to 0 than 1), so it doesn't matter how much you multiply it by - it will remain 0.

thanks BabaJ. thats exactly what it was. didn't pay attention and I was zoomed in, so yes all my were 0 something. zoomed out and it is fine.