How to reproduce:
1. Create and open a new project
2. In the Hierarchy, right click and select UI > Scroll view
3. Drag and drop the created “Canvas” GameObject into the Project tab, to create a prefab
4. Back in the Hierarchy, click on the arrow to the right of the “Canvas” GameObject
5. In the Hierarchy, select the “Scroll View” GameObject
6. In the Inspector, “Rect Transform” component, change the value of “Width” field to 3000
7. In the Hierarchy, click the arrow to the left of the Prefab name (in this instance “Canvas”)
8. Repeat step 5
9. Observe the Inspector

Expected result: The “Width” value is 3000
Actual result: The “Width” value is 30

Reproducible with: 2022.3.62f1, 2023.3.0b7, 6000.0.50f1, 6000.1.5f1, 6000.2.0b4
Not reproducible with: 2021.3.52f1, 2023.3.0b6

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

Notes:
- When another value is changed, the previous one gets updated properly
- All values within “Rect Transform” component are affected
- Other UI elements are also affected (Button, Slider etc.)
- Editing prefab in both “in isolation” and “in context” reproduces the issue