ath(4) and stealth AP

Hi,

I'm having a problem with the ath(4) device recently.

After the "Big update on ath and net80211", 
http://mail-index.netbsd.org/source-changes/2006
/03/02/0001.html,
both of my ath on pci (ThinkPad X31) and ath on cardbus
cannot find
wireless network which provided by stealth Access Point.

Since wi(4) and iwi(4) can connect the same network at same
time,
I think it is the problem on ath.

Also, when I change the AP setting to announce its SSID, ath

CAN connect to the network.

Has anybody else noticed any problem like this ?

Tacha