[horizon] Networks for different availability zones in Horizon

In Horizon "Launch Instance" workflow, in its 4th step of selecting networks for the new instance, it would always show all the available networks from all availability zones, regardless of which "Availability Zone" got picked in 1st step of "Details".

I tried to update some DB field for availability zone hint for the relevant network, and that did not help.

Any way to ensure in Horizon "Launch Instance" GUI workflow, after a user picking one availability zone in step 1, it would only show the related networks in that availability zone as available networks in step 4?