Going to bump this againâŚwith the recent Ember update we had a number of plugins to update along with Discourse. With the progress bar not working, we had to keep refreshing the page to see if each update was complete, making the process even longer. Would really appreciate seeing this lingering subfolder issue resolved .
Definitely agree, just found this out myself. It looks like the long polling base url isnât getting populated correctly on the upgrade pages.
(If it doesnât conflict with any of your other routes, you can add a quick hacky workaround route for /message-bus, but this is obviously a short-term solution)