UI Builder Radio Button Does Not Clear Previously Selected

[Velma]

UI Builder page in Rome. Add radio buttons component, configure. "Radio buttons value set" shows the correct last-selected value. However, at least visually other buttons do not clear. (I am not sure how to access the properties of the component in JavaScript beyond the event payload, so I can't see what else might be going on underneath.) Refreshing the component from code does not make it display correctly.

Details: Windows. I have tried in Edge and in Chrome. I have tried in my real development environment and in my PDI. Having failed with my real requirement, I have tried using the default choices from the component (removing the readonly and disabled). I have tried using the (working) sample from the component playground. Behavior is the same with all attempts. I do not see this listed in known issues.

Unless someone has a workaround, I suppose I will rebuild with toggles or checkboxes! (Or a dropdown, but not appropriate for this need.) Thanks for any suggestions. How do I report bugs?

[Velma · Accepted solution]

Bottom line: Fill in Identifier.
I found the resolution to this, finally. As configured out of the box (in Rome Patch 5, which appears to be what I have in the PDI as well as at work), the component (as it would seem many others) does not work (adapting Options per samples provided elsewhere or per my actual needs).  The radio buttons appear to multi-select (although underneath as best I can determine they still have one value and the correct/last clicked one). The solution is to fill in the Identifier property (which is blank by default and not documented as being required, even if one slogs through the documentation pages). Once Identifier is filled in (I filled it in with the ID, I don't know if it can be anything), it just works!