*Steps to reproduce:*

1. Open attached project, select Assets > Sprites > BirdHeroSprite.png

2. In Inspector, click "Open Sprite Editor" and go to Custom Physics Shape tab with bird sprite in preview

3. Ensure no sprite rects are selected and click "Generate All" button

4. Observe loading bar appears but does not progress/hangs

*Actual results:* After pressing Generate All, loading bar hangs without generating custom physics shapes

*Expected results:* After pressing Generate All, loading completes without loading hanging and custom physics shape is generated for all sprites in sheet

*Reproducible with versions:* 6000.0.0f1

*Not reproducible with versions:* 2023.2.0a17, 2022.3.26f1

*Can’t test with versions:* 

*Tested on (OS):* Windows 11 Pro

*Notes:*
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