To specify the problem:
The cloned volume gets the normal export-policy and veeam updates the exports as expected but the root policy of the NetApp SVM gets the following export rule:
So veeam is not able to attach the newly created clone to that ESXi because of the rules above. That makes no sense to me.
I've tested it with a customer and their facing the same problem with a fresh install of B&R 9.5 and a upgrade version of B&R 9.5
NetApp NCDA, NCIE, NCSIE