Composer multiselect adds selectable recipients from first autocomplete GET action

[sazanof]

Steps to reproduce

1. You must have contacts in your Contacts app (the more, the better: 'Apple Contact', 'Banana Contact', 'Grape Contact')
2. Click 'New Message'
3. Start search in 'To' field. Type 'a'....
4. Wait till autocomplete?term=a ended
5. See - 3 recipients in Multiselect
6. Quickly add 'pple'
7. Wait till autocomplete?term=apple ended
8. See 1 recipients in Multiselect
9. Click on that one
10. After multiselect clears value, other contacts from FIRST request added to Multiselect

Expected behavior

Selectable recipients will must changed, when request results ate changed (autocomplete?term=xxxxxx)

Actual behavior

Selectable recipients takes from first autocomplete request

Mail app version

No response

Mailserver or service

No response

Operating system

No response

PHP engine version

No response

Web server

No response

Database

No response

Additional info

Based on - #7240 (comment)

In my case there are 500 recipients. In Composer Multiselects there are 1500 (3x500).
Browser sleeping some times if I sleeping and s l o w l y t y p i n g