Windows Update Progress Bar Fail

If you have some progress you can use a progress bar to show this progress.

So, if you copy some files and have already copied about 60%, you may see something like this:

Progress bar showing copy progress of some files

Knowing this, what’s wrong with this image?

Indeterminate progress bar on download progress in Windows Update

Why the heck do I get an indeterminate progress bar for a download progress. Hell, there’s even a percentage displayed for the download.