Reproduction steps:

1. Open the attached project
2. Open the “/Assets/Spline.unity” Scene
3. Select the “Spline” GameObject in the Hierarchy window
4. Enter the Spline Edit Mode and select one of the knots of the “Spline” GameObject in the Scene View
5. Press the “Reverse Spline Flow” button 10 times in the Element Inspector and observe the changes after each press in the Scene View

Expected result: The Spline Flow gets reversed without any errors and shape changes
Actual result: After the 3rd press - Quaternion To Matrix conversion errors appear, and after the 8th press or more - the shape of the spline begins to change erratically

Reproducible with: 2.0.0, 2.1.0 (2021.3.13f1, 2022.1.22f1, 2022.2.0b15, 2023.1.0a18)
Couldn’t test with: 1.0.0-pre.8 (2020.3.41f1), 1.0.1 (2021.3.13f1, 2021.1.22f1) - Spline package errors

Reproducible on: Windows 10 (21H2), M1 MacOS 13.0 (22A380)