Hello @dbarros and @flawless,
I've created a ticket for that so I can investigate more on it. You can find the ticket here: https://trello.com/c...inserting-value
and you can follow the progress of it by pressing the button "follow":
Screenshot 2019-05-24 at 08.09.20.png
I will inform this forums post once this is done and released on the next version.
Till the bug is fixed can you please use: "multiselect_native" as a work-around?
Thanks @web-johnny for the follow up.