Opening changelog in mod update window stops mod downloading progress

[diamenciarz]

When mods are updating, clicking the changelog button of any mod stops the progress bar from moving forward visually. Mechanically, the mod downloads to 100% and then pauses. No further mods are downloaded as long as any mod changelog window is open.
As soon as the changelog window is closed, the mod progress bar updates to actual current progress. If it was 100%, only at that moment it starts downloading another mod update.

This is a problem, because leaving the changelog window open and switching to another app stops your update downloading progress.