IP address changes on Azure VM restore

Good day all

I hope everyone is doing well.

This one is a bit of a strange one.
Customer has two VM’s (in Azure) that are clustered with IP’s assigned as expected.

Servers were accidentally destroyed and rebuilt at an OS level only. No data drives were added. The request was to just to an ‘In Place’ restore and overwrite the two rebuilt VM’s.

Once the restore process was complete it was noticed that the IP addresses of the two nodes swapped around.

I am not convinced this is something that happened in the restore process as the job logs of both servers show the correct IP’s during the restore process.
I’m not an expert in Azure support, so it is possible something in that stack could have caused this, or would the ‘In Place’ option have something to do with it?

I do need to mention that the IP’s are assigned statically by Azure.

I hope that makes sense.

Thanks all.

Mauro