"EndLayoutGroup: BeginLayoutGroup must be called first" gets thrown when editing a Aseprite file with Sprite Editor

How to reproduce:

1. Create a new project using the Universal 2D template and open it
2. Ensure that the “2D Aseprite Importer” package is installed
3. Import the “ExplosionPixel“ Aseprite file (file is attached in the Internal Notes)
4. Select the imported file in the Project window
5. Navigate to the Inspector window and click “Open Sprite Editor”
6. Click on any Sprite and change its Pivot, Custom Outline, or Custom Physics shape (may take a few attempts to trigger)
7. Click “Apply“ to save the changes
8. Observe the Console window

Actual result: An “EndLayoutGroup: BeginLayoutGroup must be called first” error is thrown
Expected result: No errors are thrown when applying changes

Reproducible with: 6000.0.13f1, 6000.0.83f1, 6000.3.24f1, 6000.6.0a7
Not Reproducible with: 6000.0.12f1, 6000.6.1f1, 6000.7.0a6
Fixed in: 6000.6.0b1, 6000.7.0a1

Reproducible on: Windows 11
Not reproducible on: No other environments tested