Get a xxx_SCLGroupParts skinCluster node after some automation steps?

[jiajun.coding]

I wrote a complex script to copy high model and then execute reduction. Everything runs well.

But sometimes when I delete unused shape orig nodes for a mesh and rename the real connected one as "XXX_SCL", it created an invisible node named "xxx_SCLGroupParts". What is it?

[jiajun.coding]

After using cmds.nodeType("xxx_SCLGroupParts"), I find that it is a groupParts node. But still not really understanding where it will use after reading https://download.autodesk.com/us/maya/2008help/Nodes/groupParts.html ...

Delete non-deformer history can remove it correctly.