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Groove missing in the drawing studio

Hello,
I would like to create a drawing for export as dxf to generate a code that controls my CNC milling machine. Unfortunately the groove in the middle part is missing.
While I place the drawing it is there (see photo) but after it is placed the groove is gone (see screenshot).
Why is that and how can I get the groove into the drawing? I need it for the GCode.
Kind regards
ProApe
https://cad.onshape.com/documents/c8853fd9fa95b07df5358ed7/w/2f932f71df653bb9b51e6645/e/9116877f9eff1ce8d932ce5b
Comments
In order to have the groove in the drawing, I have to insert this middle part separately and place it over the existing one with all the parts.
I don't understand why this is the case.
And I find it strange that it is present during insertion, but disappears after insertion!
Quel est le rapport avec de l'argent?
D'ailleurs: "…ça sent", pas "ça sens"!
si je peux me permettre
I guess you figured it out because in the linked document it's visible?
did you know you could export a flat face from the part studio directly to dxf? with some cheating in the model, this may be easier than going trough a drawing… (depending on what/how you're milling)
"I guess you figured it out because in the linked document it's visible?"
No, I had to superpose the part with the groove on the whole geometry; when I inserted the whole geometry the groove was missing! See my message from June 8th.
"did you know you could export a flat face from the part studio directly to dxf?"
No, I didn't
How can I delete my message in French in response to an unrelated message that has been deleted, both from June 10th?
It is sub-optimal that the messages are not either numbered or keep the time, and not just the date. This would make it easier to reference a specific message.