nuxeo-document-suggestion deletion behavior is not homogeneous

Setup the project

1. in Studio create a project
2. create a document type named multiTest with a multi-valued document property
3. generate the form in Designer
4. synchronize the project server-side
5. create 4 documents aaa, bbb, ccc and cccd

Homogeneous scenario

1. create a 4th document of type multiTest
2. in the creation form search and select aaa, and bbb
3. search for ccc and click the found document (selectValue.png)
4. observe it appears in the result (see valueSelected.png)
5. press Backspace
6. observe it deletes all the results
7. save the document

Non-homogeneous scenario

1. open the myGeniusDoc document
2. click the multivalued field
3. press Backspace
4. observe it does not empty the field but rather selects the value next to the cursor (see selectInsteadOfDelete.png)
5. press Backspace a second time
6. observe the value is deleted but the other values remain (see secondPressDelete.png)
7. close the edition panel
8. open the myGeniusDoc document again
9. search for ccc and click the found document
10. observe it appears in the result
11. press Backspace
12. observe the field is now empty

Expected behavior: in every case. Having the cursor at the end of the results and pressing the Backspace key should always empty the field or select the last value before deleting it. It should not have different behaviors based on the previous actions.