Progress bars not updating while downloading

[humdinger]

This is hrev53552, 32bit

When updating from that hrev to hrev53597, I noticed that the blue progress bar at the top and the green bars to the right of the package icons aren't updated while the package is being downloaded.
Only when the download of the package has finished, the icon progress bar popped to 100% (and maybe the top progress bar flickered to 100%, to be immediately going back to 0% of the next package).

[diver]

Could it be related to hrev53589?

[humdinger]

Maybe just a fluke. Updating from hrev53597 to hrev53606 now and the progress bar works as expected. Closing ticket...