How to reproduce:
1. Create and open a project
2. Install the TextMeshPro package (Window > Package Manager)
3. Install (Window > TextMeshPro > Install Examples & Extras)
4. Open the “Assets/TextMesh Pro/Examples & Extras/Scenes/20 - Input Field with Scrollbar“ Scene
5. Enter Play Mode
6. Delete all text in the top Input Field
7. Press the Enter key a bunch of times (>10)
8. Observe the scrollbar

Expected result: The Scrollbar handle gets smaller with each added line
Actual result: The Scrollbar handle stays the same size

Reproducible in: 2023.2.0a14, 6000.0.50f1, 6000.1.4f1, 6000.2.0b3
Not reproducible in: 2022.3.62f1, 2023.2.0a13

Reproduced on: Windows 11 Pro (24H2)
Not reproduced on: No other environment tested

Notes:
- Handle only changes in size if there is text in those new lines
- Does not reproduce with “Preserve Whitespace“ wrapping method