Describe the bug
If you use a select item in a regform that has enough items to enable scrolling (like country), the user may scroll with the wheel / touchpad, but if the scroll bar is clicked on to scroll "the old way", the options closes instead of allowing to scroll by clicking.

To Reproduce

1. create an event and a regform, add the country field
2. try to scroll via clicking

Expected behavior
scrolling should be possible via scrollbar

Additional context
sandbox event.