"Saving Prefab to immutable folder is not allowed" error is thrown when saving a Prefab in an immutable package with an XRInteractorLineVisual component

How to reproduce:
1. Open the user-submitted project
2. Open the scene "SampleScene" (Assets/Scenes/SampleScene.unity)
3. Save the project (File > Save)
4. Open and inspect the Console window (Window > General > Console)

Expected result: No errors are seen in the Console
Actual result: "Saving Prefab to immutable folder is not allowed" error is seen in the Console

Reproducible with: 2019.4.32f1, 2020.3.23f1, 2021.1.28f1, 2021.2.3f1, 2022.1.0a15

Error:
Saving Prefab to immutable folder is not allowed: Packages/com.microsoft.test.xrinteractorlinevisual/TestLine.prefab
UnityEditor.EditorApplication:Internal_CallGlobalEventHandler ()