Can't setup WIFI in 20.1.7

[mistergefahrensucher]

During installation i was able to assign ath0_wlan0 to opt2.
On the web gui configured the wifi settings.
After saving all settings are gone and the interface looks like a normal cable.
All WiFi related setting are missing.
I tried to delete the interface and assign it new.
But i can' select ath0_wlan0 or ath0 i only see reX (the cables)
I tried to create a new wlanx at ath0 but this gives a error that my device doesn't support this.
This could not be because i can assing ath0_wlan0 via console.
There must something wrong with the webgui.

Here some errors
[30-May-2020 20:33:59 Europe/Berlin] PHP Warning:  Illegal string offset 'wep' in /usr/local/www/interfaces.php on line 525
[30-May-2020 20:34:07 Europe/Berlin] PHP Warning:  Illegal string offset 'wep' in /usr/local/www/interfaces.php on line 525
[30-May-2020 20:34:13 Europe/Berlin] PHP Warning:  Illegal string offset 'wep' in /usr/local/www/interfaces.php on line 525

In Interfaces: Assignments i can't see ath0_wlan0 but during installation i was able to assign ath0_wlan0 to opt2.

The Adapter seems ok

ath0:  mem 0xfdaf0000-0xfdafffff irq 24 at device 0.0 on pci1
ath0: [HT] enabling HT modes
ath0: [HT] 1 stream STBC receive enabled
ath0: [HT] 1 stream STBC transmit enabled
ath0: [HT] 2 RX streams; 2 TX streams
ath0: AR9280 mac 128.2 RF5133 phy 13.0
ath0: 2GHz radio: 0x0000; 5GHz radio: 0x00c0

Also i have tested the wifi Adapter in pfsense 2.4.5 there is no problem to assign and use the WiFi.

can sombody help ?