Hello!

Since several months each time I use Discover to fetch system updates, all the progress bars freeze when the main progress bar is at 49% (just after the download of the packages ends and their installation starts). Then nothing changes, neither for the global progress bars, nor for the individual progress bars per application to be updated and they stay stuck until the update process ends and the usual "up to date" is shown... The app window is not frozen, though (you can navigate between the tabs, etc.), it's just that progress bars do not work anymore...

Pkcon has no problem with showing the progress bar as the updates progress, no freezing there.

Has anyone seen anything simillar? And what might be the solution?

Yes, I have same bug

There is an official bug report here: https://bugs.kde.org/show_bug.cgi?id=447216