Bring back `dirWithIndexFallback` (#3206) #2

Job	Run time
build / pack-nuget	4m 22s
lint / Lint Go	2m 12s
build / prepare	0s
lint / Lint TypeScript	47s
test / Golang Integration Tests	6m 49s
test / Golang Mod Up To Date	22s
test / Proto Up To Date	4m 26s
test / Golang Unit Tests	1m 59s
test / TypeScript Unit Tests	3m 3s
All required checks done	0s
	24m 0s

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