Why Don't .Flash and .Redirect Fire for Route in a Node.js Express Project?

Question

I'm using flash widely in my Node.js Express application, but for one route I can't get flash or redirect to work. Views are with pug:

form.permissive(action=`/setPermissive/${device._id}/${device.allowUnlock}` method="POST")
  label.groupTitle(for="setPermissive") Allow Unlock
    button.switch(type="submit" name="setPermissive")
      label.switch
        if (device.allowUnlock)
          input(type="checkbox" name="setPermissive" checked)
        else
          input(type="checkbox" name="setPermissive" )
        span.slider

route:

router.post('/setPermissive/:id/:permissive', catchErrors(deviceController.changePermissive));

controller:

exports.changePermissive = async (req, res) => {
  const permissive = (req.params.permissive === "false") ? false : true;
  const device = await Device.findOneAndUpdate({ _id: req.params.id },  { $set: { allowUnlock : !permissive } }, {
    new: true
  }).exec();
  req.flash('success', `Successfully updated ${device.name}`);
  res.redirect('/devices');
};

I know Device.findOneAndUpdate executes because I can see it in the backend, but I do not get the flash message, I do not get redirected, and the UI does not reflect the update. If I manually refresh the page, I get the flash message and the UI is updated.

I have similar routes that flash and redirect as expected, e.g.:

form.form(action=`/changeStatusEnabled/${device._id}/${newStateEnabled}` method="POST")
  input.button(type="submit" value=`${currentStateEnabled}` onclick=`return confirm('${msgConfEnabled}');`)

router.post('/changeStatusEnabled/:id/:state', catchErrors(deviceController.changeStatusEnabled));

exports.changeStatusEnabled = async (req, res) => {
  const myBoo = (req.params.state === "enable") ? true : false;
  const device = await Device.findOneAndUpdate({ _id: req.params.id }, { $set: { isEnabled: myBoo }}, {
    new: true
  }).exec();
  req.flash('success', `Successfully updated ${device.name}`);
  res.redirect(`/devicesAdmin`);
};

What am I missing?

Answer 1

For some reason the .permissive class causes the hiccup. If anyone might know why, I'm all ears.

changed:

form.permissive(action=`/setPermissive/${device._id}/${device.allowUnlock}` method="POST")
  label.groupTitle(for="setPermissive") Allow Unlock
    button.switch(type="submit" name="setPermissive")
      label.switch
        if (device.allowUnlock)
          input(type="checkbox" name="setPermissive" checked)
        else
          input(type="checkbox" name="setPermissive" )
        span.slider

to:

form(action=`/setPermissive/${device._id}/${device.allowUnlock}` method="POST")
  label.groupTitle(for="setPermissive") Allow Unlock
    button.switch(type="submit" name="setPermissive")
      label.switch
        if (device.allowUnlock)
          input(type="checkbox" name="setPermissive" checked)
        else
          input(type="checkbox" name="setPermissive" )
        span.slider