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On the right side go to the green triangle (object data properties). At the top there is the name of the mesh you are using (not the object!). Right beside the meshname there is a number. Just click on it once and it is fixed. Ask again if it didnt work :)
Yes, it has to do something with the subdivision. I don't understand why the edge is disappearing (on the area i marked red) and not on the other ones.
That was pretty much what I was looking for, thanks for the clear answer! Animation with keyframes is common in combination with Body constraints, right?
I did help, thank you! If I need physics and animation you usually start with physics and then bake them into keyframes, right? Where does rigging belong in the physics/Animation context?
It seems to work, thank you! The only thing that is still off is that the cord and the lightbulb are not really aligned when the wind appears. (They are perfectly alligned at the beginning). I put a photo in my question post.