Steps to reproduce:
1. Open the attached "AspriteProject" project (Google Drive)
2. Select “Birt_anim_01” Asperity in the Project window
3. In the Inspector window > General > Import Mode change from Animated Sprite to Sprite Sheet
4. Click “Apply”
5. Change Import Mode back to Animated Sprite
6. Click “Apply”
7. Observe the Asperite in the Project window and observe Console window

Actual results: Error is thrown in the Console and Asperite Asset is broken
{code:java}
Failed to import file Assets/bird_anim_01.aseprite. Error: Index was outside the bounds of the array.
at UnityEditor.U2D.Aseprite.AsepriteImporter.OnImportAsset (UnityEditor.AssetImporters.AssetImportContext ctx) [0x001df] in ./Library/PackageCache/com.unity.2d.aseprite@ca048e7ac308/Editor/AsepriteImporter.cs:240
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&) (at /Users/bokken/build/output/unity/unity/Modules/IMGUI/GUIUtility.cs:219)
{code}
Expected results: No errors thrown in the Console, Asprite Asset is not broken

Reproducible with versions: 1.1.8 (2021.3.50f1, 2022.3.60f1, 6000.0.43f1), 1.2.3 (6000.1.0b11, 6000.2.0a7),

Tested on (OS): Apple M1 Max, Sequoia 15.2