Description of problem:
Installing SilverBlue 30 into VirtualBox, selected Blivet Partitioning, then tried to cancel to go back

Version-Release number of selected component:
anaconda-30.25.6

The following was filed automatically by anaconda:
anaconda 30.25.6 exception report
Traceback (most recent call first):
  File "/usr/lib/python3.7/site-packages/blivet/actionlist.py", line 86, in remove
    self._actions.remove(action)
  File "/usr/lib/python3.7/site-packages/blivet/threads.py", line 53, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/blivetgui/blivet_utils.py", line 1350, in blivet_cancel_actions
    self.storage.devicetree.actions.remove(action)
  File "/usr/lib/python3.7/site-packages/blivetgui/osinstall.py", line 80, in remote_call
    return utils_method(*args)
  File "/usr/lib/python3.7/site-packages/blivetgui/blivetgui.py", line 671, in actions_undo
    self.client.remote_call("blivet_cancel_actions", removed_actions)
  File "/usr/lib64/python3.7/site-packages/pyanaconda/ui/gui/spokes/blivet_gui.py", line 277, in on_undo_action_button_clicked
    self.blivetgui.actions_undo()
ValueError: list.remove(x): x not in list

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-SB-ostree-x86_64-30 rd.live.check quiet
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         5.0.9-301.fc30.x86_64
product:        Fedora
release:        Fedora release 30 (Thirty)
type:           anaconda
version:        30