Make2D issue with mesh block, has to be exploded and joined

Hi @GregArden @pascal

I made a script to set up a view to a clippingplane to make section drawings and I see that Make2D struggles with large mesh objects. I have linked files with the architecture and for some reason I have to explode AND join the mesh into one to get an OK make2D result.

To the left you see the result if it isn’t joined. To the right you see it joined.
And still I get missing curves along some windows and balconies.
(The model is in meters and the tolerance is set to one mm (0.001 units) )

Also I see that Make2D ignores the clipping geometry so what’s behind that is drawn:

Can you send a model and a script that demonstrates the problem so I can reproduce it and investigate.