[BUG] Generated geometry is incorrect and cannot be properly extruded using the solidify modifier

[wipmate]

Description

When creating a geometry using 2D arcs in a specific arrangement, the resulting bezier/mesh has some artifacts which make it difficult to continue working with the generated mesh.

Steps to reproduce:

1. Create new blender project
2. Sketch shapes using 2D arcs and lines (must have some complexity, e.g. as shown in the attached video)
3. Convert the sketch to a mesh
4. Apply the "Solidify" modifier and increase thickness to observe the artifacts

Blender.Sketcher.Bug.Report.mp4

Download the model as shown in the video:
broken_sketch_solidify.zip

(Apparently I don't get any logs from the plugin.)

PS: Huge shoutout to this project, it has already served me well in the past and I hope to continue my work with it!

Addon Version

0.27.3

Blender Version

4.0

Platform

Windows

[dtremain]

This is similar to my issue #440. I have reproduced this bug using points and lines, and changing the Mesh Curve Resolution to 1 did not "fix" it. The .zip contains the .blend file and a .txt file that describes the steps I used to create it.
Bug440.zip

I can create a cross shaft using two sketches - one a horizontal rectangle, the other a vertical rectangle, and then boolean UNION them together.
You MUST use the Point / Line approach if you encase the plus object (shaft) in a circle to get a bore because the two union'ed rectangles do not work.