I can confirm this bug. I installed Trixie on a brand new thinkpad p14. I am on a newer kernel though:
gargle@p14:~$ uname -a
Linux p14 6.12.48+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.48-1 (2025-09-20) x86_64 GNU/Linux
gargle@p14:~$ cat /etc/debian_version
13.1
gargle@p14:~$ sudo dmesg | grep -i ath11k
[ 16.414533] ath11k_pci 0000:02:00.0: BAR 0 [mem 0x90600000-0x907fffff 64bit]: assigned
[ 16.414550] ath11k_pci 0000:02:00.0: enabling device (0000 -> 0002)
[ 16.416163] ath11k_pci 0000:02:00.0: MSI vectors: 32
[ 16.416169] ath11k_pci 0000:02:00.0: wcn6855 hw2.1
[ 16.416498] ath11k_pci 0000:02:00.0: firmware: failed to load ath11k/WCN6855/hw2.1/firmware-2.bin (-2)
[ 16.416516] ath11k_pci 0000:02:00.0: firmware: failed to load ath11k/WCN6855/hw2.1/firmware-2.bin (-2)
[ 16.416529] ath11k_pci 0000:02:00.0: firmware: failed to load ath11k/WCN6855/hw2.1/firmware-2.bin (-2)
[ 17.299873] ath11k_pci 0000:02:00.0: chip_id 0x12 chip_family 0xb board_id 0xff soc_id 0x400c1211
[ 17.299882] ath11k_pci 0000:02:00.0: fw_version 0x11088c35 fw_build_timestamp 2024-04-17 08:34 fw_build_id WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.41
[ 17.626382] ath11k_pci 0000:02:00.0 wlp2s0: renamed from wlan0
[ 17.638811] ath11k_pci 0000:02:00.0: Failed to set the requested Country regulatory setting
[ 17.638816] ath11k_pci 0000:02:00.0: failed to process regulatory info -22
[ 17.639119] ath11k_pci 0000:02:00.0: Failed to set the requested Country regulatory setting
[ 17.639122] ath11k_pci 0000:02:00.0: failed to process regulatory info -22
gargle@p14:~$ apt policy firmware-atheros
firmware-atheros:
Installed: 20250410-2
Candidate: 20250410-2
Version table:
*** 20250410-2 500
500 http://ftp.be.debian.org/debian trixie/non-free-firmware amd64 Packages
100 /var/lib/dpkg/status
Greetings,
Johan