Reset variable reactive

[JCauz]

Hi,

I'm having a problem with something that's actually quite simple. I have a compose which allows to create or modify an element by opening a modal to display the form.
So I have a props which is not mandatory with a default value (a class instance). I initialize a variable in the setup and I give the default value. After modification, I save and therefore via an emit I send the element. But the problem is that when I open the modal again the fields stay filled with the data from the last item to send. Worse, the element that the parent to retrieve is changed if I modify in the modal.

I wanted to use the code:

Object.assign(Object.create(Object.getPrototypeOf(myClass)), myClass)

To initialize the variable in the setup script and the same in the computed when the viable to close the modal is false I redo a

myVar = reactive(Object.assign(Object.create(Object.getPrototypeOf(props.initMyVar)), props.initMyVar))

I also did this for the emit.
But when I reopen the parent element is no longer modified, but nothing reacts properly.

Do you have an idea ?
I note that I am trying to reset with a js class instance not an object.

Thanks a lot for your help