The WFH shift also exposed the ones who have self discipline and the ones who are not. Nobody is asking you to go beyond the contracted hours. Inability to stop working is a fault of the person and not the mode of working. Agree that the managers fear kicked in so they start to pretend to do work for "visibility". However, that's a sign of a rotten culture and these people were most likely NOT productive in the first place and now they are being exposed therefore they have a need to over-compensate for it.
There are plenty of us who became extremely productive and can finally enjoy life rather than constantly play the spectacle in the office or sit in traffic for hours. And don't get me started on the ones who are neurodiverse or have any kind of disability.