[Bug 286689] igb nic flaps when tap added to bridge

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286689

            Bug ID: 286689
           Summary: igb nic flaps when tap added to bridge
           Product: Base System
           Version: 13.5-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: r4@sovserv.ru

This is similar to what is described in  Bug #249427

But I have all conflicting options turned off:

ifconfig_igb0="inet 192.168.1.1/24 -tso6 -tso4 -txcsum  -txcsum6 -rxcsum
-rxcsum6 -lro"


#ifconfig igb0
igb0: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
       
options=48520b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,NOMAP>
        ether ec:f4:bb:be:f7:8c
        inet 192.168.1.1 netmask 0xffffff00 broadcast 192.168.1.255


And still when you start the first vm, there is an up/down of the interface.
This started after upgrading to 13.5, everything worked fine in 13.4

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