Primatte edge problem

I have a problem with the primatte giving me black edges. It’s probably me who is doing something wrong.

Here is the node tree when I output the unpremultiplied image from Primatte and then do the premult with a premult node. This gives me the correct edges when doing a merge.

Correct result from the tree above.

Here is the node tree when I output the premultiplied image from Primatte. This gives me black edges when doing a merge.

Bad result from the tree above.

My question is. Why aren’t the results the same?

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