I was working on a chip component (great addition by the way) but on the web preview the delete icon was not there, when I change the icon on the settings it appears like it is selected NONE, but after choosing another icon the delete icon is still missing from the preview.
I´d try also with the preview on the theme tab and the delete icon is not rendered.
The front icon works normally (initially is no shown but when I change the icon it appears on the preview)
Also, do you have documentation for the ui builder? Sometimes I create topics for things that works how it is supposed, but that for me is not that evident.