Control adds selected values as a new list item

[RMattC88]

Video showing the behavior: https://github.com/user-attachments/assets/68e9754d-b6a0-445f-904a-bcb2fedb81d3

Example: list items are: A, B, C, D Select A and B Save the work item. Select D Now the list items items are A, B, A;B, C, D Why is "A;B" getting added to the list?. If this value is selected, then it duplicates the values, so there would be 2 "A"s and 2 "B"s