Multichoice question alternative values deleted after adding taxonomy term to the question using View bulk operation.

Multichoice question alternative values deleted after adding taxonomy term to the question using View bulk operation. This happens with the other methods of updating multichoice question with taxonomy term(edit field.

steps to reproduce

1. Create multichoice question with taxonomy term (which is empty at the time of creation).
2. Create view (Table view of fields including VBO for entity update option)
3. Select the multichoice question from the view and Update the taxonomy term using VBO
4. after updating the taxonomy term to multichoice question, it is observed that alternative values of the question disappeared.