Repro steps:
1. In OSX, create a default new VFX and drag it into the scene
2. Observe that only 1 particle is showing
3. Open the VFX Graph and change its capacity to 129
4. Observe how the full amount being spawned is now shown

Notes:
- Happens in the 18.3, 19.1, and 19.2 packages (i.e. 4x, 5x, and 6x)
- A capacity of 128 or lower produces only 1 particle with a spawn rate of 10.
- Related to 1117644, but a more visible issue, thus logging separately
- OSX only (does not repro on Win with DX11 or Vulcan)