Disable the first timestamp decoding rule when there is a prefix #2265

Job	Run time
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	7m 14s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	8m 48s
build-and-test-cpp-x86_64 (macos-11, mkl)	10m 59s
build-and-test-cpp-x86_64 (macos-11, dnnl)	10m 20s
build-python-wheels (ubuntu-20.04, auto64)	52m 32s
build-python-wheels (macos-11, auto64)	45m 28s
build-python-wheels (windows-2019, auto64)	1h 7m 34s
build-python-wheels (ubuntu-20.04, aarch64)	2h 21m 56s
build-python-wheels (macos-11, arm64)	24m 59s
build-and-test-cpp-aarch64 (openblas)	6m 2s
build-and-push-docker-images	38m 28s
check-python-style	16s
build-and-deploy-docs	40s
test-python-wheels (ubuntu-20.04)	10m 58s
test-python-wheels (macos-11)	6m 22s
test-python-wheels (windows-2019)	3m 18s
publish-python-wheels-on-pypi	0s
	7h 15m 54s

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