APEX 21.2 See https://apex.oracle.com/pls/apex/f?p=134181:77
If you hover next to the Option 1 or Option 2 labels (or use Dev tools of course), you will see there is a radio button next to those labels. Clicking on the labels behaves like normal.
So why are the radio buttons not displayed?!
Thanks
Update: This seems to be a Chrome issue. They display fine in Firefox