bizarre network problem on kernel 6.6.4

[Fourhundred Thecat]

Hello,

I have the most bizarre network problem on my laptop that I have ever
seen, and I don't even know where to start:

This is lenovo T14s Gen 4, using qualcomm driver ath11k_pci

Previously I was using kernel 6.6.1 and wireless network was working fine.

Now I compiled kernel 6.6.4 with identical config, and when I boot it,
wireless network does not work:

- WPA supplicant authenticated and associated successfully
- ifconfig shows interface wlan0 is configured properly and has IP
address 10.1.4.8
- route is configured properly:

  default via 10.1.4.1   wlan0 onlink
  10.1.4.0/24            wlan0 proto kernel src 10.1.4.8

but I cannot ping even my Gataway: 10.1.4.1

bizarrely, when I start tcpdump on my gateway, I see arp requests coming
from my laptop asking for some strange public ips, such as 208.163.36.0

when I interrupt ping, and start again, then arp asks for other strange IPs.

But in every case, I see only these arp requests, not the pings coming
from my laptop.

But when I ping the other way (from gateway to my laptop), I do see the
incoming pings on my laptop (but no response pings)

Also, with "arp-scan -l" on my laptop, I see other devices on my
wireless subnet:

  10.1.4.1    00:0d:b9:53:ea:3c    PC Engines GmbH
  10.1.4.2    b0:7f:b9:50:5b:21    NETGEAR

any idea what is going on?