Project launch fails when browser plugin enabled

As soon as I enable the web browser widget in plugins, restart my project, then launch it, my launch fails.
ERROR: AutomationTool terminated with exception: AutomationTool.AutomationException: Stage Failed. Missing receipt ‘XXXXXX.target’. Check that this target has been built.
If I then disable the browser widget, restart the project and launch the project again, everything is fine.

I tried using an empty (4.15) project and do the same thing, the launch fails as well (so it’s not related to my project).
Anyone having this problem? How can I resolve this issue please?

Is this a bug or is it because it’s experimental and therefore can’t be launched (or packaged)?