problem with wpa_supplicant 2.10

[Mathias]

Hello,
recently, the distribution I'm entrusting my Linux system to (Gentoo)
decided to no longer support wpa_supplicant 2.9, so I was forced to
switch to 2.10. However, 2.10 could no longer connect to my wifi (a
simple WPA2-PSK 5GHz found in almost every household these days). I
confirmed that switching back to 2.9 fixed the issue (took some
tinkering to make Gentoo behave). I will attach a the log files for the
broken 2.10 and working 2.9 (my interface is called "wifi" and my
network SSID is "lufthaufen_5Ghz"). In particular, observe that 2.10
claims that a "parse failed":

> wifi: 0: f4:6b:ef:6a:28:6f ssid='lufthaufen_5GHz' wpa_ie_len=26 rsn_ie_len=24 caps=0x1111 level=-69 freq=5200  wps
> wpa_parse_wpa_ie_rsn: invalid group cipher 0x8 (000fac02)
> wpa_parse_wpa_ie_rsn: invalid group cipher 0x8 (000fac02)
> wifi:    skip RSN IE - parse failed
> wifi:    skip WPA IE - GTK cipher mismatch
> wifi:    reject due to mismatch with WPA/WPA2

While 2.9 manages to parse just fine:

> wifi: Radio work 'scan'@0x55f363c95ca0 done in 3.293043 seconds
> wifi: radio_work_free('scan'@0x55f363c95ca0): num_active_works --> 0
> wifi: Selecting BSS from priority group 0
> wifi: 0: f4:6b:ef:6a:28:6f ssid='lufthaufen_5GHz' wpa_ie_len=26 rsn_ie_len=24 caps=0x1111 level=-61 freq=5200  wps
> wifi:    selected based on RSN IE
> wifi:    selected BSS f4:6b:ef:6a:28:6f ssid='lufthaufen_5GHz'

I have no idea what an "invalid group cipher 0x8" is and how to debug
that. Might I take this opportunity and suggest printing more
informative error messages in the logs? :)

thanks, cheers and best regards
-Mathias

PS: my wifi board is and I am running kernel version 5.10
> 07:00.0 Network controller [0280]: Intel Corporation Dual Band Wireless-AC 3165 Plus Bluetooth [8086:3166] (rev 99)
> 	Subsystem: Intel Corporation Dual Band Wireless-AC 3165 [8086:4210]
> 	Flags: bus master, fast devsel, latency 0, IRQ 143
> 	Memory at a4300000 (64-bit, non-prefetchable) [size=8K]
> 	Capabilities: [c8] Power Management version 3
> 	Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
> 	Capabilities: [40] Express Endpoint, MSI 00
> 	Capabilities: [100] Advanced Error Reporting
> 	Capabilities: [140] Device Serial Number 1c-1b-b5-ff-ff-91-45-ba
> 	Capabilities: [14c] Latency Tolerance Reporting
> 	Capabilities: [154] L1 PM Substates
> 	Kernel driver in use: iwlwifi
> 	Kernel modules: iwlwifi

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