Steps to reproduce:
1. Create new Unity project using Universal 2D Template
2. Import provided “bird_anim_01.aseprite” Asset
3. Select Aseprite Asset in Project window
4. In Inspector window > Layer Import change Import Mode from “Merge Frame” to “Individual Layers”
5. Press “Apply” button below
6. Once applied, press ctrl+z until “Inspector - Unsaved Changes Detected” pop-up appears
7. Press “Save“
8. Observe the Console window

Actual results: Error “RecordCreation cannot be called while an undo is already processing UnityEditor.EditorApplication:Internal_CallGlobalEventHandler ()” is thrown after saving changes

Expected results: No errors thrown in the Console after saving changes

Reproducible with versions: 6000.3.5f1, 6000.4.0b5, 6000.5.0a5

Can’t test with versions: 6000.0.66f1 (different error is thrown - Assertion failed on expression: '!GetUndoManager().IsProcessing()')

Tested on (OS): Windows 11