Openwrt Mesh Wifi shown no encryption

I don't know if this is iwinfo misreporting the encryption status, my openwrt mesh wifi connection was established and running well, however it showed no encryption, is it a bug or something I have missed out?

/etc/config/wireless
config wifi-iface 'wifinet2'
        option device 'radio1'
        option mode 'mesh'
        option encryption 'sae'
        option mesh_id 'my-mesh'
        option mesh_fwding '1'
        option mesh_rssi_threshold '0'
        option key 'wb2065t@'
        option network 'lan'

root@EA8100:/etc/config# iwinfo
phy1-mesh0 ESSID: "my-mesh"
          Access Point: 26:F5:A3:8D:AC:49
          Mode: Mesh Point  Channel: 36 (5.180 GHz)  HT Mode: VHT80
          Center Channel 1: 42 2: unknown
          Tx-Power: 20 dBm  Link Quality: 60/70
          Signal: -50 dBm  Noise: -89 dBm
          Bit Rate: 780.0 MBit/s
          Encryption: none
          Type: nl80211  HW Mode(s): 802.11ac/n
          Hardware: 14C3:7615 7615:14C3 [MediaTek MT7615E]
          TX power offset: none
          Frequency offset: none
          Supports VAPs: yes  PHY name: phy1

root@EA8100:/etc/config#

This is a known bug in earlier versions of iwinfo where it incorrectly reported "Encryption: none".
This is fixed in the version of iwinfo included with OpenWrt 23.05.x.

I am currently running Openwrt 23.05.3, it came back the encryption in reporting a while after I restarted the router, but it still missing the no encryption in misreporting later.