Reproduction steps:
1. Open the attached project “SplinesProject”
2. Open the “Assets/Scenes/SampleScene.unity“ scene
3. In the Hierarchy Window select the ‘Spline’ GameObject and click the Spline tool in the Scene View
4. In the Scene View, click the 'Spline'(curve), select ‘Knot 2 (Spline 0)’ and change the Bezier to ‘Mirrored’
5. Observe the Spline shape in the Scene View

Expected result: The Spline shape remains the same
Actual result: The Spline shape is distorted/changes

Reproducible with: 1.0.1, 2.5.1 (2021.3.33f1), 2.5.1 (2022.3.14f1, 2023.2.2f1, 2023.3.0a16)

Reproducible on: macOS Intel 14.0