Update combobox item clear the options

In a form, when we set the options of a combobox out of the initial configuration, updating the control always clear the options.

Instructions to reproduce:

1 - Display the combobox options. They will appear normally.
2 - Press the Update button. (To update the width of the control)
3 - Display the combobox options once again. No options will be showed

https://snippet.dhtmlx.com/jwuw3ae2