Unfolding a circle cutout sketch does not produces a circle. (Unfolder V2)

[povauboin]

Describe your issue

EDIT: this is a issue with the unfolder V2 only. I just find out that using the V1 by checking "Revert to old unfolder" produces the expected output.

Unfolding a circle cutout sketch does not produces a circle.

I made a circle sketch that I use with the SheetMetal SketchOnSheet command.
As I understand from the wiki, "this tool acts as if it would unfold the sheet metal object, cut the holes, and refold the object."

So, when cutting a circle, and then unfolding the object to export for manufacturing, I would expect the output to be a perfect circle again.
But this is not the case.

More precisely, the unfold output is correct:

• for the portion of the circle lying on the base face (before the bend).
• and for the portion lying on the leg (after the bend).

But is incorrect for the portion lying on the bend.

I made a very simple shape to reproduce this:

• "L" base shape,
• with a WrappedCutout (SheetMetal SketchOnSheet)
• the cutout sketch is a circle, spanning on the base face, the bend, and the leg face.

The file is attached:
metalcurve.FCStd.zip

On the picture below, it is clear that the unfold output in orange is not a circle. (look at the middle part on the left and on the right)

I have the intuition that the error occurs when an arc from a sketch is projected during the fold/unfold on the cylindrical shape that will form the bended edge

FreeCAD version info + SheetMetal WB version

OS: Arch Linux (XFCE/xfce/xcb)
Architecture: x86_64
Version: 1.0.2.39319 (Git)
Build type: Release
Branch: makepkg
Hash: 256fc7eff3379911ab5daf88e10182c509aa8052
Python 3.13.7, Qt 6.9.2, Coin 4.0.5, Vtk 9.5.1, OCC 7.9.1
Locale: English/United States (en_US)
Stylesheet/Theme/QtStyle: FreeCAD Dark.qss/FreeCAD Dark/
Installed mods: 
  * sheetmetal 0.7.55
  * fasteners 0.5.43
  * LCInterlocking
  * kicadStepUpMod 11.7.7

Put here any screenshots or videos (optional)

[shaise]

I'm not sure if the unfolding is correct in this case, however unfolding a circle cut on a fold will not produce a circle at the flat material since the metal stretches according to the K factor.

[Freedom-of-dreams]

The errors that currently exist during "deployment" have forced me to completely abandon this feature in my work. I may not use it now, but it still needs to be resolved as soon as possible because the very essence of the work may be lost in the future.