Well actually, I found that I can’t process geometry that comes from archicad in rhino.compute. Not sure why, but exactly the same script that pushes to speckle some transformation on a wall coming from revit won’t work with one from archicad (locally, it does work). I would love to understand the compute limitations with speckle further, both with archicad and revit (see also this)
Can you share the commit url’s of both the revit and archicad wall? 
As a side note, we’re also trying to understand the Compute limitations with Speckle as the use-cases arise. As it’s tricky to predict what will work and what not on a general basis. We have some improvements coming on the next release though. Don’t hesitate to ping us with anything that doesn’t work/meet the expectations 