Reproduction steps:
1. Open the attached project “1506395-Text LinearSpace“
2. Open the “SampleScene“ Scene
3. Zoom in on the “Text (TMP)“ GameObject through the Game View
4. Change the Color Space from Gamma to Linear in the Project Settings
5. Observe the Game View

Expected result: The text looks the same with both Color Space settings
Actual result: The text has a more pronounced falloff when Color Space is Linear

Reproducible with: 3.0.6 (2020.3.45f1, 2021.3.20f1, 2022.2.9f1, 2023.1.0b7, 2023.2.0a6), 4.0.0-pre.2 (2022.2.9f1, 2023.1.0b7, 2023.2.0a6)

Reproduced on: macOS 13.0.1 (Intel), macOS 12.4 (M1, User reported)

Note - Reproducible in Build