Search results behave random

[dannyyy]

Describe the bug
There are some strange inconsitencies between the search result, the selected item, and the displayed list after opening the drop down again.
One step-by-step reproduction list is provided with a code example.

My questions are:

• After selecting one of the search results and reopening the list, what should appear?

  • The previous search result, but constantly even I open close the list multiple time?
  • A merge between the staticly provided entries (A, B) and the search result, but constantly?
  • Only the static entries and the current selected one?
  • The static entries and all previously selected entries?

• After playing a bit with opening the drop down, picking an entry, search for new one I open get stuck that the selected entry from a search result isn't selected and displayed. Either the old value remains or nothing is displayed (not sure what is really selected in the HTML input)

Recreate it in Codepen
https://jsfiddle.net/yvohLm4a/3/

To Reproduce
Steps to reproduce the behavior:

1. Open the drop down -> [A, B] Expected
2. Search by any two characters -> [Null, Eins, Zwei, Drei, ..., Zehn] Expected
3. Pick the first entry -> Selected value is displayed Expected
4. Open the drop down -> [Null, Eins, Zwei, Drei, ..., Zehn] Partially Expected
5. Pick the second entry -> Selected value is displayed Expected
6. Open tht drop down -> [A, B, Null, Eins] is displayed Unexpected
7. Search by any two characters -> [Null, Eins, Zwei, Drei, ..., Zehn] Expected
8. Pick the first entry -> "A" is displayed not the selected entry Unexpected
   ...