Cannot pair or connect to any Bluetooth devices on 2022 MBP (J493) with BRCM4378 rev 5

[serialexperiment]

I have a 2022 Macbook Pro J493 running Asahi and have been unable to pair to any new devices or connect to previously paired Bluetooth devices starting on kernel 6.8.10-400. 6.8.9-406 is the last kernel version where Bluetooth works.

I am fairly confident that this is some sort of kernel bug given that the issue is directly tied to kernel version. I tried looking for anything between 6.8.9-406 and 6.8.10-400 and found this commit, but this is outside of my area of expertise and I'm not completely sure if it's at all related. Additionally, at a high level the behavior seems nearly identical to #293.

Here is as much diagnostic info as I could think of. Nothing gets logged to the journal other than the same errors I see in bluetoothctl.

The bluetoothctl connection error:
Failed to connect: org.bluez.Error.Failed le-connection-abort-by-local

The bluetoothctl pairing error:
Failed to pair: org.bluez.Error.AuthenticationFailed

lspci | grep -i brcm
01:00.1 Network controller: Broadcom Inc. and subsidiaries BRCM4378 Bluetooth Controller (rev 05)

Here is the output of asahi-diagnose:
asahi-diagnose-20250120-215110.txt

Here is the output of bluetoothctl show:
bluetoothctl_show.txt

Here is a btmon capture while I try to connect to my keyboard:
btmon.txt