Autocomplete tag with prefix not properly added on first attempt in Mix-Mode

[FreshDoktor]

Prerequisites

• I am running the latest version
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed

💥 Demo Page

https://jsbin.com/vogabovodo/1/edit?js,console,output

Explanation

• What is the expected behavior?
  When I select a tag from the dropdown with a mouse click, it should be present in the value of the change event.

• What is happening instead?
  The tag is only present in the change event after the second attempt to add the tag by clicking in the dropdown.

• Steps to reproduce with the demo

1. Write $b into the input.
2. Select banana from the dropdown with a mouse click.
3. Delete the b and write it again to open the dropdown again.
4. Select banana again.
5. Check the event values in the console output. The output should contain two messages:
   "$b"
"​[[{\"value\":\"banana\",\"prefix\":\"$\"}]]"

• What i already tried

1. Using another pattern