Reproduction steps:
1. Open the attached “doublinebreaksissue.zip” project
2. Open the “testlinebreaks” Scene
3. Select the “Text (TMP)” GameObject from the Hierarchy
4. In the ‘Localize String Event’ Component set the ‘String Reference’ to None
5. Open the ‘Localization Tables’ Window (Window > Asset Management > Localization Tables)
6. Click “+ New Table Collection” and create a new Table (e.g. ‘Testing’)
7. Click “Import” and import the attached “TEST_LB.csv”
8. Observe the line breaks of the “MUSEUM_TANKX_TOOLTIP” key in the English cell
9. Select the “Text (TMP)” GameObject from the Hierarchy again
10. In the ‘Localize String Event’ Component set the ‘String Reference’ to ‘Testing/MUSEUM_TANKX_TOOLTIP’
11. Observe the line breaks in the Game view
12. Save and Exit the project
13. Reopen the project
14. Observe the Game view

Expected result: There are two line breaks as observed before
Actual result: There are four line breaks

Reproducible with: 1.4.5 (2021.3.47f1), 1.5.3 (2021.3.47f1, 2022.3.54f1, 6000.0.32f1, 6000.1.0a9)

Reproducible on: macOS 14.6.1 (M2 Max), Windows 11
Not reproducible on: no other environment tested

Note:
- User discovered this issue when re-importing CSV's from the external localization theme where more and more linebreaks got added. Also when changing the text sometimes <CR> gets converted to /r/k