Repro steps:
1. Import the attached unity package
2. Open Test Scene
3. Observe how the VFX "Main" appears as white quad aligned upwards

Expected outcome:
For it to appear like the purple quad next to it.

Note:
- subgraph operators seem to work fine, this looks like a subgraph block-specific issue
- the subgraph block works fine when used directly in a system, but if that system is nested within another, it is disregarded