yes, you are right, sorry for that, everything becomes polyline if it goes through the OpenNest_Geometry calculator 
if you want to use Transforms, this should work fine:
Autonesting_inno_pipelines_Transforms.gh (24.9 KB)
And the output will be exactly the input geometry, just translated/rotated
the reason why these 2 shapes are not being nested is because rotating them by 180 degress (360 divided by Rotations value, which is 2, so 360/2=180°) does not allow those to be contained in the sheet height, so they are not part of the nesting
increasing Rotations to maybe 3, for sure 4, will eventually allow EVERYTHING to be rotated in steps of 120 degrees or 90 degrees
