With the clipping path of a clip group or a clipping layer selected, or a
member of a compound path that is the clipping path, Paste in Back put the
clipboard's objects below it. The bottom pasted object then became the
clipping path. With nothing selected in a clipping layer, Paste in Back did
the same at the bottom of the layer.
Paste in Back now puts the objects right above the clipping path, as Send to
Back keeps art above it.