Ensure parse errors on more invalid YAML cases #1138

Job	Run time
samples (Release, macos-latest)	3m 0s
samples (Debug, windows-2022)	3m 15s
samples (Release, ubuntu-24.04)	4m 37s
samples (Release, windows-2022)	11m 7s
samples (Debug, ubuntu-24.04)	13m 14s
samples (Debug, macos-latest)	1m 52s
	37m 5s

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