On selecting Flips and Rotate Contents Tool in the Tile Palette when Grid is disabled in the Scene View then it causes the editor to throw multiple errors, refer to the attached video

Steps to repro:
1. Create a new project with a 2D Template
2. Edit > Preferences > 2D > Tile Palette > Add Flips and Rotate Tool in the Deafult list
3. Hierarchy > Create > 2D Object > Tilemap > Rectangular Tilemap
4. Window > 2D > Tile Palette > Select Flips and Rotate Tool
5. Hierarchy > Grid > Inspector > Disable
6. Tile Palette > Click on > Flips and Rotate Tool

Actual Result:
Multiple errors are thrown on selecting the Flips and Rotate tool in the Tile Palette

Expected Result:
No error in the console

Note: Flips and Rotate Tool introduce in the Unity 2021.2.0a10

Reproducible in:
2021.2.0a16, 2021.2.0a10 with package version 1.0.0

Environment:
Occurring on Windows 10 & macOS 10.15.

Stack trace:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Tilemaps.PaintableSceneViewGrid.CellLayout () (at Library/PackageCache/com.unity.2d.tilemap@1.0.0/Editor/PaintableSceneViewGrid.cs:299)
UnityEditor.Tilemaps.PaintableGrid.get_cellLayout () (at Library/PackageCache/com.unity.2d.tilemap@1.0.0/Editor/PaintableGrid.cs:63)
UnityEditor.Tilemaps.FlipTool.Flip (UnityEngine.GridBrushBase+FlipAxis axis) (at Library/PackageCache/com.unity.2d.tilemap@1.0.0/Editor/EditorTools/FlipTool.cs:25)
UnityEditor.Tilemaps.FlipXTool.OnActivated () (at Library/PackageCache/com.unity.2d.tilemap@1.0.0/Editor/EditorTools/FlipTool.cs:89)
UnityEditor.EditorTools.EditorToolManager.set_activeTool (UnityEditor.EditorTools.EditorTool value) (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.EditorTools.ToolManager.SetActiveTool (UnityEditor.EditorTools.EditorTool tool) (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.Tilemaps.GridPaintPaletteWindow.DoTilemapToolbar () (at Library/PackageCache/com.unity.2d.tilemap@1.0.0/Editor/GridPaintPaletteWindow.cs:548)
UnityEditor.Tilemaps.GridPaintPaletteWindow.OnGUI () (at Library/PackageCache/com.unity.2d.tilemap@1.0.0/Editor/GridPaintPaletteWindow.cs:478)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect) (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.DockArea.OldOnGUI () (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Boolean canAffectFocus) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUIRaw (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUI (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.IMGUIContainer.HandleEvent (UnityEngine.UIElements.EventBase evt) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <3d9ce814fcb44accb4bf84d178018794>:0)

InvalidOperationException: Attempting to set the active tool from EditorTool.OnActivate or EditorTool.OnDeactivate. This is not allowed.
UnityEditor.EditorTools.EditorToolManager.set_activeTool (UnityEditor.EditorTools.EditorTool value) (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.EditorTools.EditorToolManager.RestorePreviousTool () (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.EditorTools.ToolManager.RestorePreviousTool () (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.Tilemaps.FlipTool.OnToolGUI (UnityEditor.EditorWindow window) (at Library/PackageCache/com.unity.2d.tilemap@1.0.0/Editor/EditorTools/FlipTool.cs:44)
UnityEditor.EditorTools.EditorToolManager.OnToolGUI (UnityEditor.EditorWindow window) (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.SceneView.DefaultHandles () (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.SceneView.OnGUI () (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect) (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEditor.DockArea.OldOnGUI () (at <03609da0ab2f44f1b4469aa7e2ed6dad>:0)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <2be794cb752d4000b163ca51b26cc1bc>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)

GUI Error: You are pushing more GUIClips than you are popping. Make sure they are balanced.
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)