ADVL is not modifying the delegations in the root zone: All the original name servers are still defined in each delegation with their original (source) IP addresses. In fact, you may not see “preferred DNS server” configured on any target machine (DC or member computer).
This stems from an incorrect configuration of TCP/IP Settings: You cannot select the “Assign IP addresses from a range” and also “Obtain DNS server address automatically”. The latter option requires DHCP, or it will do nothing. Thus all DCs end up with no preferred DNS server, and there is no information with which to update the delegations. The ADVL GUI, however, allows you to configure TCP/IP settings this way. This appears to be a UI defect.
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