URP Scene Templates are not editable when first opened from the New Scene dialog

Steps to reproduce:

1. Unzip and open attached "[Internal link] SmallRepro.zip"
2. In the hierarchy, select "Packages/com.unity.repropackage/Editor/Repro.scenetemplate"
3. Observe that the opened Inspector is uneditable
4. From the toolbar, click on Default > Default to reset the Editor layout
5. Observe the previously opened Inspector is now editable
6. Deselect and Reselect the SceneTemplate asset
7. Observe that the Inspector is uneditable again

Actual results: After resetting the Editor layout, the same Scene template becomes editable in the Inspector, while previously it was not editable

Expected results: The editability of Scene templates (an potentially other object like ScriptableObjects ?) in the Inspector should be consistent (either always editable or always read-only), and should not change just because the Editor layout is reset.

This is particularly true here because it is a non local package where assets should be immutable.

Reproducible with versions: 6000.0.66f1, 6000.3.7f1, 6000.4.0b7, 6000.5.0a5

Tested on (OS): Windows 11

Notes:

• Reproduces with "Basic (URP)", "Indoors (URP)" and "Outdoors (URP)" templates