Text in the Inspector window appears with missing spaces when using GUIStyle.CalcSize() and inspecting a file in the Inspector window

Reproduction steps:
1. Open the attached "PROJECTFILE" project
2. Select the "Assets/README.md" file
3. Observe the Inspector window text

Expected result: Text in the Inspector window appears without missing spaces
Actual result: Text in the Inspector window is missing spaces

Reproducible with: 2023.1.0a20, 2023.1.15f1, 2023.2.0b11, 2023.3.0a7
Not reproducible with: 2021.3.30f1, 2022.3.10f1, 2023.1.0a19

Reproducible on: macOS 13.6 (M1 Max)
Not reproducible on: No other environment tested

Note: On version 2023.1.0a19, the text in the Inspector window isn't missing spaces, but the whole text disappears when the mouse is hovered away from the Inspector window