Issue: After adding and removing a spline within a spline container on a prefab (or child object of a prefab), the removed spline will automatically be added back during runtime. This is not the case when the object is not a prefab.

Steps to reproduce

• Create a new Unity project
• Import the Splines package
• Create two game objects with spline containers
• Add a spline to each spline container (spline count = 1 in each spline container)
• Make one of these game objects a prefab
• Add an additional spline in both spline containers (spline count = 2 in each spline container)
• Remove the additional spline in both spline containers (spline count = 1 in each spline container)
• Enter play mode
• Observe the spline container component on both game objects

Expected result
Both spline containers should contain only 1 spline

Actual result
The spline container on the prefab object in the scene has automatically added another spline at runtime. So, the non-prefab object correctly has 1 spline while the prefab object now contains 2.

Versions tested
Unity 2022.3.21f1 (Splines 2.5.2), Unity 2022.3.35f1 (Splines 2.6.1), 6000.0.13f1 (Splines 2.6.1)

Video link: [https://drive.google.com/file/d/1w0U7XCa3nMnW-j-XIPWTyY9jtC44LuOx/view]