Description of problem:
Issue triggers while trying to create a LUKS encrypted BTRFS LVM volume. The structure looked like this:

p1: EFI /boot/efi
p2: ext4 /boot
p3: LUKS2
  > LVM Group
    > LVM Volume
   |  > LUKS2
   |    > swap
    > LVM Volume
    | > LUKS2
    |   > btrfs / * crash here!

Version-Release number of selected component:
anaconda-41.35


The following was filed automatically by anaconda:
anaconda 41.35 exception report
Traceback (most recent call first):
  File "/usr/lib/python3.13/site-packages/blivetgui/osinstall.py", line 234, in _reraise_exception
    raise type(exception)(message + str(exception) + "\n" + traceback)
  File "/usr/lib/python3.13/site-packages/blivetgui/blivetgui.py", line 514, in add_device
    self._reraise_exception(result.exception, result.traceback, message,
AttributeError: Failed to add the device:'DeviceFormat' object has no attribute '_header_size'
Traceback (most recent call last):
  File "/usr/lib/python3.13/site-packages/blivetgui/blivet_utils.py", line 1346, in add_device
    actions = add_function(self, user_input)
  File "/usr/lib/python3.13/site-packages/blivetgui/blivet_utils.py", line 1096, in _create_lvmlv
    actions.extend(self._create_format(user_input, luks_dev))
                   ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/blivetgui/blivet_utils.py", line 935, in _create_format
    actions = self._create_btrfs_format(user_input, device)
  File "/usr/lib/python3.13/site-packages/blivetgui/blivet_utils.py", line 958, in _create_btrfs_format
    device.format = btrfs_fmt
    ^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/blivet/threads.py", line 49, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.13/site-packages/blivet/devices/storage.py", line 836, in <lambda>
    lambda d, f: d._set_format(f),
                 ~~~~~~~~~~~~~^^^
  File "/usr/lib/python3.13/site-packages/blivet/threads.py", line 49, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.13/site-packages/blivet/devices/storage.py", line 786, in _set_format
    if fmt.max_size and fmt.max_size < self.size:
                                       ^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/blivet/threads.py", line 49, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.13/site-packages/blivet/devices/luks.py", line 80, in _get_size
    size = self.raw_device.size - self.raw_device.format._header_size
                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'DeviceFormat' object has no attribute '_header_size'

Additional info:
hawkey.log:     2024-12-13T20:01:18+0000 INFO === Started libdnf-0.73.3 ===
version:        41
kernel:         6.11.4-301.fc41.x86_64
addons:         com_redhat_kdump
cmdline_file:   BOOT_IMAGE=/images/pxeboot/vmlinuz inst.stage2=https://download.fedoraproject.org/pub/fedora/linux/releases/41/Server/x86_64/os/ ip=dhcp quiet
release:        Fedora release 41 (Forty One)
type:           anaconda
package:        anaconda-41.35
reason:         AttributeError: Failed to add the device:'DeviceFormat' object has no attribute '_header_size'
product:        Fedora
hashmarkername: anaconda
executable:     /sbin/anaconda
cmdline:        /usr/bin/python3  /sbin/anaconda