luci: luci in 24-rc2 always config back VHT20 to HT20

Is there an existing issue for this?

• I have searched the existing issues

screenshots or captures

No response

Actual behaviour

when make an change to GL-A1300 wifi
luci always set config back to
uci set wireless.radio0.htmode='HT20'

Expected behaviour

it should set to uci set wireless.radio0.htmode='VHT20' or HT20 if need

Steps to reproduce

1. edit wireless config
2. save
3. luci auto set 2g to HT20

Additional Information

NAME="OpenWrt"
VERSION="24.10.0-rc2"
ID="openwrt"
ID_LIKE="lede openwrt"
PRETTY_NAME="OpenWrt 24.10.0-rc2"
VERSION_ID="24.10.0-rc2"
HOME_URL="https://openwrt.org/"
BUG_URL="https://bugs.openwrt.org/"
SUPPORT_URL="https://forum.openwrt.org/"
BUILD_ID="r28161-ea17e958b9"
OPENWRT_BOARD="ipq40xx/generic"
OPENWRT_ARCH="arm_cortex-a7_neon-vfpv4"
OPENWRT_TAINTS=""
OPENWRT_DEVICE_MANUFACTURER="OpenWrt"
OPENWRT_DEVICE_MANUFACTURER_URL="https://openwrt.org/"
OPENWRT_DEVICE_PRODUCT="Generic"
OPENWRT_DEVICE_REVISION="v0"
OPENWRT_RELEASE="OpenWrt 24.10.0-rc2 r28161-ea17e958b9"

What browsers do you see the problem on?

Firefox

Relevant log output

No response

No source file or test is named. Reproduce the issue by editing the wireless configuration in LuCI on the reported GL-A1300 setup, saving it, and checking whether radio0 is written as HT20 or VHT20. Done means LuCI preserves or selects VHT20 when supported instead of always writing HT20.