Reproduction steps:
1. Open the attached “IN-101536.zip” project
2. Open the “SampleScene”
3. Enter Play mode
4. Observe the Console

Expected result: Each value change should trigger exactly one callback event
Actual result: Each new LocalizedString creation adds another callback subscription that persists, resulting in an increasing number of duplicate callbacks (e.g., value 5 triggers 6 callbacks, value 6 triggers 7 callbacks, etc.)

Reproducible with: 1.4.5 (2022.3.62f1) 1.5.4 (2022.3.62f1, 6000.0.48f1, 6000.1.3f1, 6000.2.0b1)

Reproducible on: Windows 10 (User reported), Windows 11
Not reproducible on: no other environment tested