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2 parts connected even though I selected New for the second one

Hello,
Even though I extracted both the part Schiene and the part Gleiter as 2 separate parts (New) in the Part Studio 2, they are combined into a single part. Why is that?
How can I attach the pen holder (which I copied from Part Studio 7 using Derived) to Gleiter?
The pen holder needs to be adjusted. Do I need to do this in the Part Studio from which I copied it and where it was designed?
Kind regards,
ProApe
https://cad.onshape.com/documents/0d4c49c42a8e97421c664639/w/6458ac9b96ce20084d5edcf9/e/2b235d64db7a71debde835eb?renderMode=0&uiState=68a0793c333a876ce5799720
Comments
It looks like Extrude 5 is merging your parts.
How may it be because I have extruded both separately?