Discrepancy of Enable clipping planes between display and make2d

CLIPPING & MAKE2D.3dm (12.0 MB)Discrepancy.pdf (127.3 KB)
I want to cut cross section showing several 3D objects to check whether they clash or not by following sequence:

  1. Enable a pair of clipping planes.
  2. Make2D
  3. Export to DWG
    However, I found “Make2D” cannot function properly as discrepancy shown attached.
    Why?