Description of problem:
Boot 23 Alpha TC2 with a single empty disk, go to custom partitioning, change scheme to LVM Thin Partitioning, click 'create them automatically'.

Version-Release number of selected component:
anaconda-23.17-1

The following was filed automatically by anaconda:
anaconda 23.17-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python3.4/site-packages/blivet/devices/lvm.py", line 618, in _setSize
    raise ValueError("not enough free space in volume group")
  File "/usr/lib/python3.4/site-packages/blivet/devices/lvm.py", line 1509, in _setSize
    super(LVMThinLogicalVolumeDevice, self)._setSize(size)
  File "/usr/lib/python3.4/site-packages/blivet/partitioning.py", line 1863, in _apply_chunk_growth
    req.device.size = size
  File "/usr/lib/python3.4/site-packages/blivet/partitioning.py", line 1923, in growLVM
    _apply_chunk_growth(thin_chunk)
  File "/usr/lib/python3.4/site-packages/blivet/autopart.py", line 505, in doAutoPartition
    growLVM(storage)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 2325, in _do_autopart
    min_luks_entropy=crypto.MIN_CREATE_ENTROPY)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 135, in decorated
    return func(*args, **kwargs)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 2372, in on_create_clicked
    self._do_autopart()
ValueError: not enough free space in volume group

Additional info:
addons:         com_redhat_kdump
cmdline:        /usr/bin/python3  /sbin/anaconda
cmdline_file:   BOOT_IMAGE=vmlinuz initrd=initrd.img inst.stage2=hd:LABEL=Fedora-S-23_A_T2-x86_64 quiet
dnf.rpm.log:    Aug 01 02:19:26 INFO --- logging initialized ---
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         4.2.0-0.rc3.git4.1.fc23.x86_64
product:        Fedora
release:        Cannot get release name.
type:           anaconda
version:        23