Fix nested flowsheet time domain construction #7195

Job	Run time
Compatibility tests	4m 32s
Check Spelling	10s
Check code formatting (Black)	30s
pytest (py3.9/linux)	21m 51s
Build Sphinx docs	5m 42s
pytest (py3.9/win64)	28m 52s
Pylint	4m 10s
pytest (py3.10/linux)	13m 18s
pytest (py3.10/win64)	31m 45s
pytest (py3.11/linux)	19m 40s
pytest (py3.11/win64)	33m 1s
pytest (py3.12/linux)	12m 49s
pytest (py3.12/win64)	29m 47s
Upload coverage report (Codecov)	0s
	3h 26m 7s

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