Small bugfix for async prefect functions #13988

Job	Run time
tests-psi4	1m 34s
tests-core (3.10, ubuntu-latest)	4m 24s
tests-engines (covalent)	8m 44s
tests-core (3.12, ubuntu-latest)	3m 16s
tests-engines (dask)	4m 35s
tests-core (3.12, windows-latest)	6m 32s
tests-defects-phonons-espresso	5m 29s
tests-engines (parsl)	2m 38s
tests-mlps	2m 22s
tests-mp	1m 9s
tests-engines (prefect)	2m 48s
tests-qchem-sella	3m 23s
tests-engines (redun)	2m 12s
tests-engines (jobflow)	44s
tests-tblite-dftbplus	2m 16s
codecov	9s
	52m 15s

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