How to reproduce:
1. Open the attached "case_1394616" project
2. Open the "New VFX" Visual Effect Graph in the Project Browser
3. Change the Capacity value of the "Initialize Particle" Node
4. Save the changes

Expected result: Capacity value remains the same value as the entered value
Actual result: Capacity value changes back to the default value - "32"

Reproducible with: 13.1.2 - 13.1.5 (2022.1.0b1, 2022.1.0b5, 2022.2.0a2)
Not reproducible with: 7.7.1 (2019.4.35f1), 10.8.1 (2020.3.27f1), 12.1.4 (2021.2.9f1), 13.1.1 (2022.1.0a16)

Note:
- Moving the Node after changing the Capacity also drops the entered value
- The "Strip Capacity" and "Particle Per Strip Count" values of the Initialize Particle Strip Node also reproduce this issue