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on the left it's good because I created extrusions even if I think it's not the right solution but on the right it's impossible to detach the 2 sides

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You have an Ngon on the right side of the object (the second middle edge that does not loop fully around the object is the cause of this.)

You need to select the knife tool (K) and manually complete the loopcut around the object so that the object is able to recognise and allow loopcuts normally again.

I would suggest watching a tutorial on Ngons and how to fix/prevent them.

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  • $\begingroup$ no there's nothing to do I searched and I still don't understand what are the points that appear? when I click on the first one it selects several faces outside :/ $\endgroup$
    – Fopsi
    Dec 24, 2022 at 13:59
  • $\begingroup$ That is caused by duplicate faces. $\endgroup$
    – Jameson4279
    Dec 24, 2022 at 17:06

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