I cannot confirm it is working in another Isadora document. Only if I have already some controls in this document and auto renumber ID conflicts enabled the control IDs will change but if auto renumber ID conflicts is disabled I get double IDs and renumber doesn't work.
To better understand how this works, can you tell me what the rules are for changing IDs.
Is the change done according to the place in the control panel, according to the order of creation or ...
PS: I wrote this post for the second time because the first ne doesn't appear after clicking on send. I apologize if this message appear two times.