Reproduction steps:

1. Open the attached project “ScrollBarTest.zip“
2. Open the “SampleScene“
3. Enter Play Mode
4. In the Game view, scroll with the scrollbar to the bottom of the “Scroll View” GameObject
5. In the Hierarchy Window, in the “Scroll View” → “ViewPort” → “Content” delete at least 4 Image GameObjects
6. Observe the result

Expected result: The scroll bar has re-adjusted its size according to the amount of objects present in the “Content” child GameObject of the “Scroll View”
Actual result: The scroll bar remains scrollable but scrolling has no effect on the “Scroll View”

Reproducible in: 2021.3.44f1, 2022.3.50f1, 6000.0.23f1

Reproducible on: MacOS 14.6.1 (M1 Pro), Windows 10, Windows 11 (user)

Notes:

* Ensure the Scroll View is scrolled to the bottom before deleting GameObjects
* For more obvious result, try to delete at least 6 Image GameObjects
* Also reproducible in Player