Fix nested flowsheet time domain construction #7197

Job	Run time
Check code formatting (Black)	31s
Compatibility tests	4m 26s
Check Spelling	8s
Pylint	4m 14s
Build Sphinx docs	5m 38s
pytest (py3.9/linux)	20m 12s
pytest (py3.9/win64)	31m 34s
pytest (py3.10/linux)	13m 25s
pytest (py3.10/win64)	34m 19s
pytest (py3.11/linux)	19m 32s
pytest (py3.11/win64)	41m 37s
pytest (py3.12/linux)	13m 7s
pytest (py3.12/win64)	31m 25s
Upload coverage report (Codecov) (linux)	10s
Upload coverage report (Codecov) (win64)	10s
	3h 40m 28s

Provide feedback