SerializedProperty.arraySize fails to update when InsertArrayElementAtIndex method is called on multiple targets

Steps to reproduce:

1. Open the attached “IN-151440” project
2. Open the scene "Assets/Scenes/SampleScene.unity"
3. In the Hierarchy window select the "Test object (1)" and "Test object (2)" GameObjects at the same time
4. In the inspector window, On “My Component” Component click the button "Add element at start" (the first button)
5. Observe the Console window

Actual result: The console shows the logs "Array size before: 2" and "Array size after: 2"
Expected result: The console should show the logs "Array size before: 2" and "Array size after: 3"

Reproducible with: 6000.0.0f1, 6000.0.84f1, 6000.3.25f1, 6000.6.3f1, 6000.7.0b2, 7000.0.0a1

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

Note: Pressing the button "Add element at end" produces the expected result, as well as pressing the button "Add element at start" when there's only one scene object selected