In recent weeks Newsom has vetoed -
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A union-supported bill that would have banned driverless testing of autonomous trucks
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A bill banning caste discrimination
And last year he vetoed a bill that would have banned solitary confinement lasting longer than 15 days - something that the UN considers torture.
Perhaps the votes only passed that hard because the congress was confident he would veto it anyway. If the rules changed, so would the votes, probably. Or maybe it would have not even made it to a vote.