When upgrading from 4.7.1 to 4.8.4, I observed a regression where the label does not move up when I programmatically add and select options. This worked fine in 4.7.1, but in 4.8.4 the label doesn't move up and the selected items overlap the label in its initial position.

I am able to work around by adding $(my-label-selector).addClass('active');

Easy workaround, but seems that this is a bug that should be addressed.

By the way, before arriving at the addClass('active') solution, I did try various combinations of .focus(), .change(), .trigger('change') on the select element, but none had any effect.