PartDesign: Fillet and Subtractive Pipe are failing to make a fillet.

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Problem description

I have this simple but irregular shape that I am failing to add a fillet.
File: [test_Body_top_fillet.FCStd.zip](https://github.com/user-attachments/files/20070769/test_Body_top_fillet.FCStd.zip)

Side view


Front view


I want to make a fillet around this highlight edge..


The fillet tool is not working, no matter the radius of the fillet.

The Subtractive Pipe tool with something like this is also failing.



It is doing something, but not the right thing, see.


I don't even have the "Allow multiple solidis" enabled in the settings.


To make it simpler, I am not even using a complicated path for the pipe tool
I am using this flat square with rounded corners.


Is it a bug?
Is there any workaround that I can use to make this filet?

### Full version info

```shell
OS: Ubuntu 25.04 (ubuntu:GNOME/ubuntu-xorg/xcb)
Architecture: x86_64
Version: 1.1.0dev.41573 (Git)
Build date: 2025/05/05 17:45:01
Build type: Release
Branch: main
Hash: 3189030c11010631e726dbe350e9077dc84109bb
Python 3.11.12, Qt 6.7.3, Coin 4.0.3, Vtk 9.3.1, boost 1_86, Eigen3 3.4.0, PySide
shiboken , xerces-c 3.2.5, IfcOpenShell 0.8.2, OCC 7.8.1
Locale: English/United States (en_US)
Stylesheet/Theme/QtStyle: OpenDark.qss/OpenDark/
Logical DPI/Physical DPI/Pixel Ratio: 96/145.143/1
Installed mods:
* Assembly4 0.50.19-dev
* sheetmetal 0.7.22
* DynamicData 2.74.0
* Curves 0.6.61
* InventorLoader 1.5.1
* diff-tools 0.1.0
* ose-piping
* OpenTheme 2024.9.1
* fasteners 0.5.38
* Curves.backup1746105636.3777354 0.6.60 (Disabled)
* osh-autodoc-workbench 0.2.3
* OpticsWorkbench 1.2.0
* lattice2 1.0.0
* kicadStepUpMod 11.6.9
```

### Subproject(s) affected?

PartDesign

### Anything else?

_No response_

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct