Last segment of a Sprite Shape Spline is affected by other segments' Sprite Variant change when no edge Sprite is selected

Reproduction steps:
1. Open the attached “IN-101997.zip” project
2. Open the “SampleScene”
3. Select “Open Sprite Shape” GameObject from the Hierarchy
4. In the Inspector, in the Sprite Shape Controller Component, toggle “Edit Spline”
5. Select the 1st or 2nd control point of the Spline
6. Change the Sprite Variant to None (the white rectangle on the very right)
7. Observe the Sprite Shape

Expected result: Last segment of a Sprite Shape Spline is not affected by the change
Actual result: Last segment of a Sprite Shape Spline is affected by the change

Reproducible with: 6000.0.46f1, 6000.0.49f1, 6000.1.4f1, 6000.2.0b2
Not reproducible with: 2022.3.62f1, 6000.0.45f1

Reproducible on: Windows 11 (24H2)
Not reproducible on: no other environment tested