Reproduction steps:
1. Open the user’s attached project
2. Open the “Assets/Splines” Scene
3. In the Hierarchy window select “Splines” Game Object
4. In the Scene View Tools tab select Spline as the Active Context
5. Edit the Splines using the tool
6. Press “Ctrl + Z” for Windows or “Cmd + Z” for macOS

Expected result: The drawn white lines are reverted back to the same positions as before the editing
Actual result: The drawn white lines positions are different from the positions as before the editing

Reproducible with: 2.0.0-pre.2(2021.3.13f1), 2.0.0 (2021.3.13f1, 2022.1.22f1, 2022.2.0b14), 2.1.0 (2021.3.13f1, 2022.1.22f1, 2022.2.0b14, 2023.1.0a18)
Couldn’t test with: 1.0.1 (2020.3.41f1) - Errors in Splines package 

Reproducible on: macOS 12.6