kern/55575: bridge broken for run(4) - 802.11?

[prlw1%cam.ac.uk@localhost]

>Number:         55575
>Category:       kern
>Synopsis:       bridge broken for run(4) - 802.11?
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 14 10:30:00 +0000 2020
>Originator:     Patrick Welche
>Release:        NetBSD-9.99.70/amd64
>Organization:
>Environment:
>Description:
box x.y.z.A ----- if0 tap0 -- vioif0 qemu x.y.z.B

brconfig bridge add if0 add tap0

If "if0" == "wm0" all works as expected.
If "if0" == "run0" box & qemu can't communicate.

Presumably run0 is the

     A bridge can be used to provide several services, such as a simple
     802.11-to-Ethernet bridge for wireless hosts, and traffic isolation.

case?

>How-To-Repeat:

>Fix: