Customize Form row number is fixed

I’m currently editing the Item form and when I try to replace few fields like the Weight Per Unit, the “row number” never change if I drag and drop it somewhere else.
It keeps the number 41 in my case and stay with number 41 when I move it. I don’t have this problem with all rows. Only fews.

It is probably because reordering Default rows is not allowed anymore:

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Thanks