autocomplete dont render selecteditem Templete with multiple=false

Describe the bug

AutoComplete component with multiple set to false, the selectedItemTemplate is not rendered after selecting an item. This works correctly when multiple=true.

Pull Request Link

No response

Reason for not contributing a PR

• Lack of time
• Unsure how to implement the fix/feature
• Difficulty understanding the codebase
• Other

Other Reason

This issue appears to be related to the template rendering logic for single-selection mode.

Workaround: None found for multiple=false.

Reproducer

https://stackblitz.com/edit/github-d16kd56z-m8fkpq9h?file=src%2Fapp%2Fapp.component.html

Environment

PrimeNG Version: 20.0.1 Angular Version: 20.1.7 Browser(s): Chrome OS: Windows 11

Angular version

20.1.7

PrimeNG version

v20

Node version

22.10.2

Browser(s)

Chrome

Steps to reproduce the behavior

1. Create an AutoComplete component with: [(ngModel)] bound to a single object multiple set to false selectedItemTemplate defined in the template
2. Search for and select an item.
3. Observe the rendered value in the input field.

  <p-autocomplete
    [(ngModel)]="value1"
    [suggestions]="items"
    (completeMethod)="search($event)"
    [multiple]="false"
  >
    <ng-template pTemplate="selectedItem" let-item>
      Custom selected item label
    </ng-template>
  </p-autocomplete>

Expected behavior

The selectedItemTemplate should be applied to the selected value when multiple=false, similar to how it works when multiple=true.