On entering Play Mode with Scene Template window open in Project Settings throw Null reference exception in the console and Scene Template window turns blank. refer attached video.

Steps to repro:
1. Create a New Project
2. Project Settings > Scene Template
3. Enter Play Mode

Actual Result:
Null reference exception in the console and Scene Template window turns blank.

Expected Result:
No errors in the console and Scene Template window should visible fairly.

Reproducible on:
2020.2.0a21, 2020.2.0a19

Not reproducible with:
2020.2.0a18, 2020.2.0a15

Note:
Scene Template feature introduced in 2020.2.0a15

Environment:
Windows 10 and Mac 10.15

Stack Trace:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.EditorStyles.get_label () (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUI/EditorStyles.cs:18)
UnityEditor.SceneTemplate.SceneTemplateProjectSettings+<>c.<CreateSettings>b__27_3 (UnityEngine.GUIContent content) (at /Users/builduser/buildslave/unity/build/Modules/SceneTemplateEditor/SceneTemplateProjectSettings.cs:385)
System.Linq.Enumerable.Max[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] selector) (at <351e49e2a5bf4fd6beabb458ce2255f3>:0)
UnityEditor.SceneTemplate.SceneTemplateProjectSettings+<>c.<CreateSettings>b__27_0 (System.String text, UnityEngine.UIElements.VisualElement rootElement) (at /Users/builduser/buildslave/unity/build/Modules/SceneTemplateEditor/SceneTemplateProjectSettings.cs:385)
UnityEditor.SettingsProvider.OnActivate (System.String searchContext, UnityEngine.UIElements.VisualElement rootElement) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Settings/SettingsProvider.cs:76)
UnityEditor.SettingsWindow.ProviderChanged (UnityEditor.SettingsProvider lastSelectedProvider, UnityEditor.SettingsProvider newlySelectedProvider) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Settings/SettingsWindow.cs:240)
UnityEditor.SettingsTreeView.SelectionChanged (System.Collections.Generic.IList`1[T] selectedIds) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Settings/SettingsTreeView.cs:66)
UnityEditor.SettingsTreeView.FocusSelection (System.Int32 selectedId) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Settings/SettingsTreeView.cs:46)
UnityEditor.SettingsWindow.SelectProviderByName (System.String name) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Settings/SettingsWindow.cs:80)
UnityEditor.SettingsWindow.RestoreSelection () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Settings/SettingsWindow.cs:188)
UnityEditor.SettingsWindow.OnEnable () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Settings/SettingsWindow.cs:106)