Listen queue overflow

[dcol]

System General log:
sonewconn: pcb 0xfffff800c816a000: Listen queue overflow: 193 already in queue awaiting acceptance

This error is recent since my updates to 21.7.3, maybe a coincidence.
Saw many references but no reasons or solutions to this error in the system logs. Did not make any recent changes to hardware. Most references mentioned a NIC overflow. If this is true, how can I tell which NIC, I have 6 in this system.
Tried adding kern.ipc.soacceptqueue value=1024 as some suggested. Made no difference.

Any suggestions on how to track this down?
And why is it always 193 in the queue? That seems strange to me. Is there a way to dump the queue?

[dcol]

Update, I disabled IPv6 and I do not see the overflow errors anymore.
Is this a bug or configuration setting?