Description of problem:
Installing fedora 28 on ciphered partition.

Version-Release number of selected component:
anaconda-core-28.22.10-1.fc28.x86_64

The following was filed automatically by anaconda:
anaconda 28.22.10 exception report
Traceback (most recent call first):
  File "/usr/lib/python3.6/site-packages/blivet/formats/luks.py", line 217, in _pre_setup
    raise LUKSError("luks device not configured")
  File "/usr/lib/python3.6/site-packages/blivet/threads.py", line 53, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/blivet/formats/__init__.py", line 603, in setup
    if not self._pre_setup(**kwargs):
  File "/usr/lib/python3.6/site-packages/blivet/threads.py", line 53, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/blivet/devices/storage.py", line 515, in setup_parents
    _format.setup()
  File "/usr/lib/python3.6/site-packages/blivet/threads.py", line 53, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/blivet/devices/storage.py", line 372, in _pre_setup
    self.setup_parents(orig=orig)
  File "/usr/lib/python3.6/site-packages/blivet/threads.py", line 53, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/blivet/devices/storage.py", line 383, in setup
    if not self._pre_setup(orig=orig):
  File "/usr/lib/python3.6/site-packages/blivet/threads.py", line 53, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/blivet/deviceaction.py", line 704, in execute
    self.device.setup(orig=True)
  File "/usr/lib/python3.6/site-packages/blivet/threads.py", line 53, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/blivet/actionlist.py", line 327, in process
    action.execute(callbacks)
  File "/usr/lib/python3.6/site-packages/blivet/actionlist.py", line 48, in wrapped_func
    return func(obj, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/blivet/blivet.py", line 135, in do_it
    self.devicetree.actions.process(callbacks=callbacks, devices=self.devices)
  File "/usr/lib/python3.6/site-packages/blivet/threads.py", line 53, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib64/python3.6/site-packages/pyanaconda/storage/osinstall.py", line 1219, in do_it
    super().do_it(callbacks=callbacks)
  File "/usr/lib/python3.6/site-packages/blivet/threads.py", line 53, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib64/python3.6/site-packages/pyanaconda/storage/osinstall.py", line 2131, in turn_on_filesystems
    storage.do_it(callbacks)
  File "/usr/lib64/python3.6/site-packages/pyanaconda/installation_tasks.py", line 438, in run_task
    self._task(*self._task_args, **self._task_kwargs)
  File "/usr/lib64/python3.6/site-packages/pyanaconda/installation_tasks.py", line 472, in start
    self.run_task()
  File "/usr/lib64/python3.6/site-packages/pyanaconda/installation_tasks.py", line 304, in start
    item.start()
  File "/usr/lib64/python3.6/site-packages/pyanaconda/installation_tasks.py", line 304, in start
    item.start()
  File "/usr/lib64/python3.6/site-packages/pyanaconda/installation.py", line 361, in doInstall
    installation_queue.start()
  File "/usr/lib64/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.6/site-packages/pyanaconda/threading.py", line 291, in run
    threading.Thread.run(self)
blivet.errors.LUKSError: luks device not configured

Additional info:
addons:         com_redhat_kdump
cmdline:        /usr/bin/python3  /sbin/anaconda --liveinst --method=livecd:///dev/mapper/live-base
cmdline_file:   BOOT_IMAGE=vmlinuz initrd=initrd.img root=live:CDLABEL=Fedora-KDE-Live-28-1-1 rd.live.image rd.live.check quiet
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         4.16.3-301.fc28.x86_64
other involved packages: python3-blivet-3.0.0-0.6.1.b1.fc28.noarch, python3-libs-3.6.5-1.fc28.x86_64
product:        Fedora
release:        Fedora release 28 (Twenty Eight)
type:           anaconda
version:        28