Steps to reproduce:

1. Open attached project.
2. Open scene "SampleScene"
3. In Project window,select Assets > PlapaBush01 to view in Inspector.
4. Click "Open Sprite Editor" in Inspector.
5. In the Sprite Editor, Click "Sprite Editor" dropdown in the top left, and change this to "Custom Outline".
6. Change the value of "Outline Detail" in the Outline Tool, and click "Generate".
7. Click "Apply" in the Sprite Editor and confirm again with the pop up.
8. Restart the project and repeat Steps 1 -> 6.

Actual results: The second time you do this, the sprites will be blocked out in black. It may happen the first time if you have opened the project before.

Expected results: Same as the first time you complete the steps, nothing unexpected occurs.

Reproducible with versions: 6000.0.10f1, 6000.0.2f1

Not reproducible with versions: 6000.0.1f1, 2022.3.37f1

Can’t test with versions: 2021.3.40f1, can't launch project on Ubuntu 24.04.

Tested on (OS): Ubuntu 24.04

Notes:

• Attached .mp4 of this issue occurring.
• The sprites are fixed with a restart of the editor, but the issue will occur again if you repeat steps 1 -> 6
• If the sprites aren't visible, change the Order in Layer of "Triangle" to -1.