Just to provide some context here ;)
We're of course not ignoring issues to talk about Easter Eggs (Lotta and me, who wrote the blog, are also not much help in fixing trade route bugs, to be honest). But before releasing a patch, the issue itself has first to be found and fixed. Plus, we always bundle multiple bugs for a Game Update and each update goes through a roughly 1 week validation period to test the fixes/changes. So: Things take a while, releasing an update for a single bug after just a few days is not realistic. Additionally, this particular issue only affected some savegames and not all players, meaning the investigation and fixing tend to take a bit longer.
Long story short, though: The issue should be fixed with Game Update 12.1 next Tuesday.