Custom attributes are not properly converted to subgraphs

Steps to reproduce:

1. Import the attached graph
2. Open graph
3. Select everything (CTRL/CMD + A)
4. Convert to Subgraph

Actual results:

• Shader errors related to custom attributes are thrown.
• Some edges of custom attributes are disconnected in subgraph.
• Attribute types are not preserved in subgraph; upon conversion, they all change to the float type.
• After conversion, the graph from which it was converted should indicate that these attributes now belong to the subgraph and cannot be deleted or edited

Reproducible with versions: 6000.0.33f1, 6000.2.0a4

Not reproducible with versions: n/a

Can’t test with versions: n/a

Tested on (OS): Windows

Notes:

• Shader error in '[OrientFixedAxis] [Feathers] Update Particle': undeclared identifier '_Open' at kernel CSMain at OrientFixedAxis.vfx(185) (on d3d11)
• [OrientFixedAxis] [Feathers] Initialize Particle.compute: Kernel at index (0) is invalid