Autocompletion for enum doesn't work without restarting qml language server

Test steps:
1. Launch Creator(qml language server should be disabled at this point)
2. Enable qml language server(Preferences -> Language Client)
3. Create a new 'Qt Quick Application'
4. Insert an enum to code
5. Test that autocompletion works for the enum -> it doesn't work
6. Restart the language server
7. Test that autocompletion works

Result:
Autocompletion works OK.

Expected result:
Autocompletion works without restarting the language server.