The parent task history needs to be recorded when the parent task field is automatically updated by subtask creation.
The history of the parent task does not record any changes when field values are automatically updated due to the addition of the subtask.
The automatic update occurs the problem that those original values are overwritten even when the subtask is created by mistakes and it is very distressing.
Change history is recorded when the start date or due date is updated within the preceding issue or following issue.
The updated history needs to remain in the parent task field when the subtask is added.