Space is not saved when adding it as the first symbol of the line

Reproduction steps:

1. Open the attached project (“StringBug.zip“)
2. Select “Assets/Data/TextData”
3. In the Inspector window select the “Text” field
4. In the second line add a space before the letter “b”
5. Save project “File>Save Project”
6. Reopen project

Expected results: Space before the letter “b” is saved
Actual results: Space before the letter “b” is not saved

Reproducible with: 2020.3.40f1, 2021.3.11f1, 2022.1.20f1
Not reproducible with: 2022.2.0a1, 2022.2.0b11, 2023.1.0a14

Reproduced on: Windows 11