Hyper-V VLANs break when guest firewall reboots

Issue below is seen in both pfSense and OPNsense

I am completely baffled and looking for help.

HOST Hyper-V 2012r2

Quad Port Intel NIC

Port1 - OS shared with HOST for management 10.15.30.x subnet LAN SWITCH

Port2 not shared with HOST OS tied to physical broadband connection

Port3 not shared with HOST OS tied tp physical LAN SWITCH

Port4 not shared with HOST OS tied to secondary broadband - not part of this GUEST setup

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VswitchWAN tied to Port2

VswitchLAN tied to Port3

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RUCKUS R600 Wireless AP

SSID1 - no VLAN

SSID2 - Access VLAN20

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Switches

Dell PowerConnect series ALL PORTS set to TRUNK (There are two switches with LAG between them, also set to trunk)

PowerShell on HOST - VswitchLAN set to trunk 20 with native 0

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GUEST OS

pfSense or OPNsense (both exhibit exactly same behavior)

Add VLAN 20

Set interface parent to HN1 (LAN)

Add DHCP server for VLAN Interface

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Everything works as expected. Wireless clients grab a lease from the VLAN subnet and are able to route to WAN

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REBOOT firewall and the functionality breaks. I see no traffic in logs or DHCP requests on the VLAN subnet Setting a host to a static IP on the VLAN subnet also does not work, no traffic. I am at a loss.

Removing interfaces and VLAN DHCP and then adding them back restores functionality and leases are passed out and traffic flows until next reboot where everything breaks again. I am at a complete loss.

Clearly I am doing something wrong with Hyper-V or the physical setup, but not sure what.

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FWIW - I Have tried adding additional vNICS to GUEST and configuring them to Access 20 - then adding the interface to pfSense or OPNsense - but I can not get traffic to flow this way.

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Looking for some help here - I really need to get this worked out.

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Thanks in advance!

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