How to reproduce:
1. Open the “Test_Dropdown“ project
2. Open the “SampleScene“
3. Build and Run for Android
4. In either one of the InputFields enter “-1“

Expected result: The '-' symbol is allowed to be entered
Actual result: The '-' symbol is not allowed to be entered

Reproducible with: 2021.3.45f1, 2022.3.51f1, 6000.0.25f1, 6000.1.0a2

Reproducible environment: macOS 14.6.1 (Intel), Windows 11 (Reporters)
Not reproducible environment: No other environment tested

Reproducible with these devices:
VLNQA00511, Samsung Galaxy S8 (SM-G950F), Android 9, CPU: Exynos 9 Octa 8895, GPU: Mali-G71
VLNQA00518, Google Pixel 4 (Pixel 4), Android 13, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00107, Huawei Nexus 6P (Nexus 6P), Android 8.1.0, CPU: Snapdragon 810 MSM8994, GPU: Adreno (TM) 430
VLNQA00335, Samsung Galaxy S20+ 5G (SM-G986B), Android 10, CPU: Exynos 990, GPU: Mali-G77

iPhone 16 Simulator (iOS 18)

Not reproducible with these devices:
VLNQA00535 - iPhone XS (MT9F2ET/A), CPU: Apple A12 Bionic, OS: 17.6.1

Not reproducible with: macOS 14.6.1 (Intel) (Play Mode in Editor and MacStandalone), Win 11 23H2 (Play mode and Windows Standalone)

Notes:
- According to the documentation the whole negative numbers should be allowed to be entered
- Decimal Content Type works correctly (allows symbols: ‘-', ‘.’, ',’)
- Reproduces with both TextMeshPro and Legacy Input Fields