Fix nested flowsheet time domain construction #7049

Job	Run time
Compatibility tests	4m 20s
Check Spelling	7s
Check code formatting (Black)	30s
Build Sphinx docs	5m 20s
pytest (py3.9/linux)	21m 4s
Pylint	4m 19s
pytest (py3.9/win64)	30m 4s
pytest (py3.10/linux)	13m 20s
pytest (py3.10/win64)	32m 33s
pytest (py3.11/linux)	19m 55s
pytest (py3.11/win64)	41m 25s
pytest (py3.12/linux)	12m 26s
pytest (py3.12/win64)	28m 24s
Upload coverage report (Codecov) (linux)	11s
Upload coverage report (Codecov) (win64)	9s
	3h 34m 7s

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