[MultiSelect] Virtualization causes dropdown to become empty

[filipKovachev]

Describe the bug
When enabling virtualisation for the MultiSelect component, the dropdown becomes empty

To Reproduce

1. Open the dropdown
2. Scroll a little bit
3. Click outside the dropdown to close it
4. Open the dropdown again
5. Dropdown is empty until you start scrolling
6. You can also notice the scrollbar resets its size after you start scrolling again

https://stackblitz.com/edit/wnjddage-rctmr9hm?file=src%2Fmain.vue

Expected behavior
The dropdown should not be empty regardless of wether the user has scrolled or not.

Ticket ID: 1677944

[Yanko-Georgiev]

Also reported in TicketID: 1688061