Steps to reproduce:
1. Create a project
2. Create Canvas and Slider GameObjects in the Hierarchy
3. Select Fill GameObject in the Hierarchy (Slider > Fill Area > Fill)
4. Change Source Image to a Sprite (ex. Knob)
5. Press “Set Native Size” button
6. Undo the change and observe the Scene

Actual results: Fill Area disappears from the Scene window
Expected results: Fill Area returns to its previous size

Reproducible with versions: 2021.3.52f1, 2022.3.63f1, 6000.0.51f1, 6000.1.7f1, 6000.2.0b5

Tested on (OS): macOS Sequoia 15.4 (M4)

Note: Issue is also reproducible with Handle Slide Area