When Editor in the Play Mode along with Sprite Editor window is opened, Switching Skinning Editor mode to Sprite Editor and apply changes of "Sprite Import Settings" in the Inspector causes the editor to throw NullReferenceException, refer the attached video

Steps to repro:
1. Open attached project (SpriteEditorTesting.zip)
2. Project window > Bird Sprite > Inspector > Sprite Editor
3. Switch to Skinning Editor
4. Enter the Play Mode
5. Switch Skinning Editor to Sprite Editor mode
6. Make Changes in Sprite Import Settings in Inspector
7. Apply the changes

Actual Result:
NullReferenceException is thrown on applying the changes of Sprite Import Settings in the Inspector when the editor in Play Mode and switching Skinning Editor to Sprite Editor mode

Expected Result:
Sprite Import Settings changes are applied gracefully

Note: 2D animation package 3.0.0 is introduced in unity 2019.3.0a10

Reproducible on:
2020.2.0a12, 2020.1.0b10, 2019.3.14f1, 2019.3.0a10

Package Found version: 4.2.4, 4.2.1, 3.2.2, 3.0.8, 3.0.5, 3.0.0

Environment:
Windows 10 & macOS 10.14

Stack trace:
NullReferenceException: Object reference not set to an instance of an object
UnityEngine.UIElements.UIR.TextureBlitter.BeginBlit (UnityEngine.RenderTexture dst) (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.UIR.TextureBlitter.BlitOneNow (UnityEngine.RenderTexture dst, UnityEngine.Texture src, UnityEngine.RectInt srcRect, UnityEngine.Vector2Int dstPos, System.Boolean addBorder, UnityEngine.Color tint) (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.UIRAtlasManager.UpdateAtlasTexture () (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.UIRAtlasManager.Commit () (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.UIR.RenderChain.ProcessChanges () (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.UIRRepaintUpdater.Update () (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.VisualTreeUpdater.UpdateVisualTreePhase (UnityEngine.UIElements.VisualTreeUpdatePhase phase) (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.Panel.UpdateForRepaint () (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.Panel.Repaint (UnityEngine.Event e) (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <f84407eabfb74dba8357ceccfe014dd7>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <9fa4332e69414794a383949976dee11c>:0)