[FS#4159] hostapd-common update breaks WiFi completely when using the config file for the previous version

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Márton Maráz (marazmarci) 

Attached to Project - OpenWrt/LEDE Project
Summary - hostapd-common update breaks WiFi completely when using the config file for the previous version
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details -  - Device problem occurs on

Linksys EA8300 AC2200 (advanced WiFi config - 802.11r related settings and a lots of other advanced settings are also modified compared to the default)
Raspberry Pi 4B+ (simple WiFi config - only SSID and password settings are modified)

 - Software versions of OpenWrt/LEDE release, packages, etc.

Linksys EA8300: 21.02
Raspberry Pi 4B+: 21.02.1

 - Steps to reproduce

`opkg upgrade hostapd-common`

It happened for me when I upgraded to 2020-06-08-5a8b3662-35 (the current latest release published on 2021-11-25) from the previous version or the one before that, I don't exactly know, but I'm sure that I kept my packages up-to-date on a weekly basis recently, so my previous version cannot be older than 7 days.

I've got this error message in the system log on both of my devices:

Sat Nov 27 16:05:40 2021 daemon.notice netifd: radio0 (10527): command failed: No error information (-524)
Sat Nov 27 16:05:40 2021 daemon.notice netifd: radio0 (10527): command failed: I/O error (-5)
Sat Nov 27 16:05:41 2021 daemon.notice hostapd: Configuration file: /var/run/hostapd-phy0.conf (phy wlan0) --> new PHY
Sat Nov 27 16:05:41 2021 daemon.err hostapd: Line 47: unknown configuration item 'snoop_iface'
Sat Nov 27 16:05:41 2021 daemon.err hostapd: Line 54: unknown configuration item 'vlan_no_bridge'
Sat Nov 27 16:05:41 2021 daemon.err hostapd: Line 56: unknown configuration item 'qos_map_set'
Sat Nov 27 16:05:41 2021 daemon.err hostapd: 3 errors found in configuration file '/var/run/hostapd-phy0.conf'
Sat Nov 27 16:05:41 2021 daemon.err hostapd: Failed to set up interface with /var/run/hostapd-phy0.conf
Sat Nov 27 16:05:41 2021 daemon.notice netifd: radio0 (10527): Command failed: Invalid argument
Sat Nov 27 16:05:41 2021 daemon.notice netifd: radio0 (10527): Device setup failed: HOSTAPD_START_FAILED
Sat Nov 27 16:05:41 2021 daemon.notice netifd: Wireless device 'radio0' set retry=0
Sat Nov 27 16:05:41 2021 daemon.crit netifd: Wireless device 'radio0' setup failed, retry=0
Sat Nov 27 16:05:42 2021 daemon.notice netifd: Wireless device 'radio0' is now down

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4159

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