[backport] fix fallback to poet pow #20047

Job	Run time
filter-changes	6s
build-tools (ubuntu-22.04)	1m 46s
build (ubuntu-22.04)	1m 45s
build-tools (ubuntu-latest-arm-8-cores)	2m 43s
lint	5m 7s
quicktests	2m 17s
build (ubuntu-latest-arm-8-cores)	3m 44s
build-tools (macos-13)	3m 37s
build (macos-13)	2m 47s
build-tools (self-hosted, macOS, ARM64, go-spacemesh)	11m 23s
build (self-hosted, macOS, ARM64, go-spacemesh)	28s
build-tools (windows-2022)	4m 32s
unittests (ubuntu-22.04)	20m 47s
build (windows-2022)	7m 14s
unittests (ubuntu-latest-arm-8-cores)	28m 33s
unittests (macos-13)	25m 46s
unittests (self-hosted, macOS, ARM64, go-spacemesh)	16m 59s
unittests (windows-2022)	29m 59s
ci-status	10s
	2h 49m 43s

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