Intersect failure / bug

Intersect fails to find one of 7 intersections of two co-planar curves.
Intersect bug.3dm (1.5 MB)

Curves are exactly co-planar.
Red dots are results of Intersect.
Obvious intersection is missed.

Rhino 7 SR20 2022-6-27 (Rhino 7, 7.20.22178.01001, Git hash:master @ a91099d78f90a58c09e8b29d9f4e96bdf663bbd2)
License type: Commercial, build 2022-06-27
License details: Cloud Zoo

Windows 10 (10.0.19044 SR0.0) or greater (Physical RAM: 64Gb)

Computer platform: DESKTOP

Standard graphics configuration.
Primary display and OpenGL: NVIDIA GeForce RTX 2080 Ti (NVidia) Memory: 11GB, Driver date: 5-19-2022 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 512.96
> Accelerated graphics device with 4 adapter port(s)
- Windows Main Display attached to adapter port #0

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)

Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 5-19-2022
Driver Version: 30.0.15.1296
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 11 GB

Rhino plugins that do not ship with Rhino

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 7\Plug-ins\Commands.rhp “Commands” 7.20.22178.1001
C:\Program Files\Rhino 7\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 7\Plug-ins\IdleProcessor.rhp “IdleProcessor”
C:\Program Files\Rhino 7\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 7.20.22178.1001
C:\Program Files\Rhino 7\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 7.20.22178.1001
C:\Program Files\Rhino 7\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Program Files\Rhino 7\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 7\Plug-ins\RhinoCycles.rhp “RhinoCycles” 7.20.22178.1001
C:\Program Files\Rhino 7\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 7.20.22178.1001
C:\Program Files\Rhino 7\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 7\Plug-ins\Displacement.rhp “Displacement”
C:\Users\dcock\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\PanelingTools\2021.3.2.446\PanelingTools.rhp “PanelingTools”
C:\Users\dcock\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\SectionTools\2021.4.21.831\SectionTools.rhp “SectionTools”

I can repeat that.
I’ll see if I can get one of the “bigger brains” to have a look.

I don’t understand it, but if I relax the tolerance to 0.01, then Intersect finds all 7 points.