When AutoClose is set to false and you select more than one item, then only the first one will be highlighted in the popup. Items are selected and present in the input but are visually highlighted.

Reproduction 

1. Run this REPL sample
2. Select more than one item from the drop-down
3. Only the first selected item is highlighted as such
4. Video example

Current

Not all selected items are highlighted, which does not match the Input.

Expected

All selected items in the drop-down should be highlighted.