Yes and no. The option to block internet access will be there for main LAN clients.1. its still there... On Network Map - Client status - click the device (any).
The option will not be there for Guest Network Pro clients, particularly those that have the Guest Network Pro option Use same subnet as main network set to disabled. In the following screen captures 192.168.2.x is the main LAN, and 192.168.52.x is a Guest Network Pro SDN.
Main Lan Client:
Guest Network Pro Client:
The issue of being unable to block Guest Network Pro client's internet access has been brought up before in other discussions. As mentioned in the Beta thread, it is possible to block a Guest Network Pro client's internet access by using the Parental Controls > Time Scheduling option. See the following post which has screen captures indicating Guest Network Pro client had their internet blocked.

Beta - Asuswrt-Merlin 3006.102.4 Beta is now available
There was an updated Firmware for the AiMesh router an Asus RT-AX-86u. I updated the firmware for it, but it's still telling me there is a new Firmware ("Bell" at upper top right still flashing). Cleared cache, all that. Thanks What does it say after you click check update on the firmware...
