I have seen that Drop-down box sends its value after the "@init" which is not practical in some cases.
To avoid this issue, I replaced the drop down by a Text input widget.
Thank you for pointing this out. I will put this on the issues list and fix it in the next release!
I will make it so that this functionality can be disabled in order to keep backwards compatible. I will check if there are any other widgets that behave in the same manner.