Sketch on curve produces invalid geometry

[Witko]

I'm, trying to cut hexagonal holes in a ring, but the cut fails on invalid geometry. It's also quite visible:

I've tried to first cut just a part of the hexagon grid and then use it to cut but it does not work reliably. Is it there something I'm doing wrong?
Thank you

OS: Arch Linux (KDE/plasma/wayland)
Architecture: x86_64
Version: 1.1.0dev.42180 (Git) AppImage
Build date: 2025/06/16 16:25:59
Build type: Release
Branch: main
Hash: fca41e4003f1680cf604b593a046ac2b1db6ba8a
Python 3.11.13, Qt 6.8.3, Coin 4.0.3, Vtk 9.3.1, boost 1_86, Eigen3 3.4.0, PySide 6.8.3
shiboken 6.8.3, xerces-c 3.2.5, IfcOpenShell 0.8.2, OCC 7.8.1
Locale: English/United States (en_US)
Navigation Style/Orbit Style/Rotation Mode: Blender/Turntable/Drag at cursor
Stylesheet/Theme/QtStyle: FreeCAD Dark.qss/FreeCAD Dark/
Logical DPI/Physical DPI/Pixel Ratio: 96/81.1092/1
Installed mods:

• ExplodedAssembly
• fasteners 0.5.38
• Curves 0.6.63
• sheetmetal 0.7.22

I've updated the Curves WB from GIT

The FreeCad project file (just rename extension to FCStd)
HexagonalCircularMesh.zip

Thank you!