To answer your earlier question: I don’t use the dev rig in my development workflow. I use https:// to serve the files over then net and hard refresh after uploading changes. But I imagine that the dev rig is meant to work the same as a live test…
If you upload the files to do a “Hosted Test” and still get the same results then it is a code problem. If using “Hosted Test” allows whispers to be sent properly then it sounds like a bug with the dev rig & should be reported.