Fix nested flowsheet time domain construction #7044

Job	Run time
Check Spelling	9s
Check code formatting (Black)	30s
Compatibility tests	4m 21s
Build Sphinx docs	5m 22s
Pylint	4m 35s
pytest (py3.9/linux)	19m 4s
pytest (py3.9/win64)	27m 48s
pytest (py3.10/linux)	13m 43s
pytest (py3.10/win64)	30m 29s
pytest (py3.11/linux)	19m 22s
pytest (py3.11/win64)	39m 41s
pytest (py3.12/linux)	12m 23s
pytest (py3.12/win64)	29m 13s
Upload coverage report (Codecov)	0s
	3h 26m 40s

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