Well, this is a weird one.

I have always parented by selecting the prop and using the top horizontal menu via Object > Change Parent. That supposedly works, as verifiable by the Hierarchy window etc. And it's worked for all the other props I've used. But not for my dynamic hair, even though the skull cap I used as a base is a merchant resource and doesn't have the problem by itself.

Anyway, just now for the heck of it I tried setting the parent on the Properties tab of the Parameters palette.

And whaddaya know - it actually seems to work!!!

But why? Shouldn't both methods have the same result?

And what must I change in the file in order for it to parent properly on load?

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3