ValueError: Virtual machine mode 'lxc' is not valid

CI jobs are getting an error:

Traceback (most recent call last):

  File "/opt/stack/new/nova/nova/conductor/manager.py", line 436, in _object_dispatch
    return getattr(target, method)(*args, **kwargs)
  File "/opt/stack/new/nova/nova/objects/base.py", line 205, in wrapper
    return fn(self, *args, **kwargs)
  File "/opt/stack/new/nova/nova/objects/compute_node.py", line 260, in save
    self._from_db_object(self._context, self, db_compute)
  File "/opt/stack/new/nova/nova/objects/compute_node.py", line 142, in _from_db_object
    for hv_spec in hv_specs]
  File "/opt/stack/new/nova/nova/objects/hv_spec.py", line 38, in from_list
    vm_mode=data[2])
  File "/opt/stack/new/nova/nova/objects/base.py", line 275, in __init__
    setattr(self, key, kwargs[key])
  File "/opt/stack/new/nova/nova/objects/base.py", line 74, in setter
    field_value = field.coerce(self, name, value)
  File "/opt/stack/new/nova/nova/objects/fields.py", line 203, in coerce
    return self._type.coerce(obj, attr, value)
  File "/opt/stack/new/nova/nova/objects/fields.py", line 362, in coerce
    raise ValueError(msg)

ValueError: Virtual machine mode 'lxc' is not valid