Reproduction steps:
1. Open the attached “Bug.zip” project
2. Open the “Scene” Scene
3. Enter the Play mode
4. Observe the Splines moving

Expected result: Both Splines are moving
Actual result: Only one Spline is moving

Reproducible with: 2.7.1 (2022.3.53f1, 6000.0.27f1, 6000.1.0a5)
Not reproducible with: 2.5.1 (2021.3.46f1), 2.6.1 (2022.3.53f1, 6000.0.27f1, 6000.1.0a5)

Reproducible on: Windows 11
Not reproducible on: no other environment tested

Notes:
- The Gizmo of the Spline is still moving, but not the Spline itself
- Issue arises from m_RebuildRequested never being set to ‘false’