Ok, skimmed through the changelog, and looks like the .zstd compression
is expected.

The issue seems to be that in my case, it's expecting to find
intel/ibt-19-0-4.sfi, but that's no longer included - with or without a
.zstd suffix. Seems we no longer include anything above ibt-18-{xxx}.

https://packages.ubuntu.com/mantic/amd64/linux-firmware/filelist (goes
from ibt-18-2 to ibt-hw)

vs

https://packages.ubuntu.com/lunar/amd64/linux-firmware/filelist (several
ibt-19-{xxx} and ibt-20-{xxx} files between ibt-18-2 and the ibt-hw
files)

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-firmware in Ubuntu.
https://bugs.launchpad.net/bugs/2036428

Title:
  Intel AX201 Bluetooth not available with 20230915.gitdfa11466-0ubuntu1

Status in linux-firmware package in Ubuntu:
  Confirmed

Bug description:
  After upgrading linux-firmware to 20230915.gitdfa11466-0ubuntu1, my
  Intel AX201 Bluetooth controller is not available post-reboot.

  The device itself shows up here:

  $ lsusb | grep -i blue
  Bus 003 Device 005: ID 8087:0026 Intel Corp. AX201 Bluetooth

  But running e.g. `dmesg | grep -i bluetooth` returns no matches, and
  bluetoothctl finds no controllers.

  Reverting to the 20230323.gitbcdcfbcf-0ubuntu1.6 package restores full
  functionality.

  n.b. Possible duplicate of LP:2036348 - I am not in a position to
  confirm those symptoms yet, but will update later.

  Running mantic pre-release on amd64:

  $ lsb_release -rd
  No LSB modules are available.
  Description:  Ubuntu Mantic Minotaur (development branch)
  Release:      23.10

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