The remote inspector target list sometimes needs to refresh to get the correct target listing. It seems like it could be an issue where the target list is attempting to update the target list before the page has fully loaded.
Created attachment 380161 [details] patch
Comment on attachment 380161 [details] patch Clearing flags on attachment: 380161 Committed r250700: <https://trac.webkit.org/changeset/250700>
All reviewed patches have been landed. Closing bug.
<rdar://problem/55973352>