This was not mentioned in the patch notes so I presume it's a bug. Industrial buildings post-patch no longer cause unrest (from industrialization). It's now possible to have happy populus with no garrison, maximum research in humanism + absolute monarchy... At least the unrest part has become way too easy now.
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OK, my mistake on this one. I was playing as GB. It appears, constitutional monarchies do not have to worry about industrial unrest since the do not have any "lower class". Does not make sense, but I guess, it's a feature - makes playing GB even more ridiculously easy.
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