SimpleAsyncComplementaryHelpers: fixed rule #2251

Job	Run time
buildAndTest (macOS-latest)	2m 45s
buildAndTest (windows-latest)	3m 58s
buildAndTest (ubuntu-latest)	5m 25s
testReleaseBinariesWithDotNet10	0s
packReleaseBinaries	0s
deployReleaseDocs	0s
publishReleaseBinaries	0s
testReleaseBinariesInDotNet8Container	0s
	12m 8s

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