Go to "Placeholder options" and click on one of the three available demo custom selects.
Previously no element was highlighted, now in 1.1 Final and 1.1-RC2 the first element is automatically shown as selected.
I guess this fix caused this issue:
[custom select] Filter placeholders out of the list of selected items…
… - Fixes: #4061
To do: items should get hover style on focus, including the first item that gets focus when the menu is opened
As discussed with @gabrielschulhof I will take care of that.
Just pushed the above todo. Closing ...