VFX Graph - Parameters not kept when Spawn or Delay mode are changed

Steps to reproduce:

1. Create a vfx graph or use VFX Graph Learning Templates

2. Open the VFX graph

3. Set some count in the Spawn system

4. Change the Spawn Mode

5. When you come back to the previous mode, the old count setting are lost 

Actual results: old settings lost

Expected results: old settings kept when you come back

Reproducible with versions: All

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes: