Changing wireless settings breaks wireless [X5000R]

Attempting to change the wireless settings for radio1 (5GHz) breaks the LUCI config, and if applied it breaks wireless.

After changing anything and hitting Save, the dialog is not dismissed and you have to click dismiss. If you look at the pending changes, it shows that it is removing the band and channel.

# /etc/config/wireless
uci del wireless.radio1.band
uci del wireless.radio1.channel
uci set wireless.radio1.htmode='HE40'

Attempting to edit the wireless settings after this gives an error.

TypeError
Cannot read properties of undefined (reading 'value')

[Crazycurly]

same issue on version openwrt-21.02 branch (git-22.052.50801-31a27f3) / OpenWrt 21.02.2 r16495-bf0c965af0

I fixed it successfully by editing /etc/config/wireless directly

config wifi-device 'radio1'
	option type 'mac80211'
	option hwmode '11a'
	option path '1e140000.pcie/pci0000:00/0000:00:01.0/0000:02:00.0+1'
	option htmode 'VHT80'
	option channel 'auto'
	option cell_density '0'

config wifi-iface 'default_radio1'
	option device 'radio1'
	option network 'lan'
	option mode 'ap'
	option key 'password'
	option ieee80211r '1'
	option ft_over_ds '1'
	option ft_psk_generate_local '1'
	option encryption 'psk-mixed'
	option ssid 'openwrt'

option channel 'auto' will somehow disappear causing the error

[h4de5]

option channel 'auto' will somehow disappear causing the error

had the same issue with latest stable 21.02.2 - add this channel option fixed it. thanks!