It wasn't considering that IfcTaskTimeRecurring might be just created and IfcTaskTimeRecurring.Recurrence is None resulting in error below
File "\api\sequence\assign_recurrence_pattern.py", line 120, in assign_recurrence_pattern
if len(file.get_inverse(settings["parent"].Recurrence)) == 1:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "\file.py", line 524, in get_inverse
inverses = [entity_instance(e, self) for e in self.wrapped_data.get_inverse(inst.wrapped_data)]
AttributeError: 'NoneType' object has no attribute 'wrapped_data'
Andrej730