The module description states
Invoices are normally created by Rules action. Updating order with an existing invoice results in creating a new invoice. Existing unpaid invoices will be cancelled, existing paid invoices will be scheduled for refund.
This does not actually appear to happen. Marking as a feature request since I think this must just be outdated documentation.
Generate an invoice for an order and then update the order. The original invoice is unaffected and a new invoice is not generated.
There are probably multiple moving parts here. What I see so far, although there may be more that I haven't gotten to yet:
Closed: won't fix
2.0
Code
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
Invoices have their own states etc... If you need to generate a new invoice after the order is updated, I'm afraid custom code will have to be written but we are not planning to do that automatically from commerce_invoice in a near future.