focusFirstElement not forcus in the first item

[NguyenVanBay101097]

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Current behavior

i add [focusFirstElement] = "true" but not working
Expected behavior

Minimal reproduction of the problem with instructions (if applicable)

What do you use to build your app?. Please specify the version

Angular version:

angular 8,

ngx-chips version:

2.2
Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

[NguyenVanBay101097]

<tag-input [ngModel]="['@item']" [onlyFromAutocomplete]="false">
<tag-input-dropdown [showDropdownIfEmpty]="true" [focusFirstElement]="true" [displayBy]="'value'"
[identifyBy]="'id'" [autocompleteItems]="autocompleteItemsAsObjects">

({{ index }}) {{ item.id }}: {{ item.value }}

//////
autocompleteItemsAsObjects = [
{value: 'Item1', id: 0, extra: 0},
{value: 'item2', id: 1, extra: 1},
{value: 'item3', id: 2, extra: 2}
];
**** explain: i test it, but no forcus in the first item, it's really important, i think so