I have discovered a weird behavior of line-art modifier. In camera view some lines stay hidden on some edges. But when you move an object outside a camera’s frame ( whole object ) all lines become visible as they should be. Is this a Blender bug or gpu drivers issue?
Ryzen 7 1800x
AMD RX5600XT ( drivers ver. 21.6.1 )
Windows 10
The only way to know it is to report the bug. I think here in BA there’s no that much people that actually uses the lineart feature of Blender. (At least i haven’t seen myself). Better a bug reported than a bug hidden 
i also have this problem. is this an orthogonal view? line art seems to work better in perspective view which is a pity because it would be very useful for blueprints / technical drawings.
Yes, it is an orthogonal view. If i could use line art mod. to create section views and wall elevations, i would be very happy It would save me a ton of time. I’m an interior designer and i’m looking for a tool to create project documentation from 3d models. Like in Sketchup. Blender is my main archvis tool, but creating 2d documentation from scratch when i have a model already built seems like a waste of time.
