SXK80: mDNS not working as intended across VLAN

With the latest firmware (V4.3.2.100), I am now able to use mDNS to connect to a printer (on VLAN 30 (network and client isolation)) and print to it from VLAN 20 (network isolation).  That is an improvement.

I am still not able to connect to an airport express airplay and play music on it.  I am able to see it from VLAN 20, but not connect to it to play music.

I notice that the airplay device show as offline in the Discovered Services (no mac address, wrong ip address, no connection type)  whereas the printer is online and has correct data.  Is there anything that can be done to ensure it is online?

Another point of reference, when I set the shared services to 'all services', this allows 'airport' service and some others for that device.  When that is enabled, I am able to use Airport Utility to configure the airport express device (on VLAN 30) from devices on VLAN 20.  This while still showing the device is offline in Discovered Services.

• I have 3 satellites.
•  VLANs
  • Default(1), Network Isolation
  • Employee(20), Network Isolation
  • IoT(30), Client and Network Isolation
  • Work(50), Client and Network Isolation (LAN5, so LAN only)
• The printer and airport express units are on the IoT VLAN (30)
• I'm wanting to print and access airport express units from the Employee VLAN (20)
•  policies set up for mDNS
  • Printers, Source VLAN = 30, Destination = 20
  • Airplay, Source VLAN = 20, Destination = 20