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I don't think reducing the invisibility duration is necessary... IMHO.
Although the ability itself is quite powerful, especially for a fast start, as it allows you to easily defeat almost any neutral creatures (perhaps it should be reduced only for this reason). But in battle, invisible units are easily detected.
So, invisibility isn't that powerful in the final stages (if I'm not playing against Necropolis, I usually try to upgrade stalkers into assassins). But when clearing neutral creatures:smile51:
However, if the invisibility duration is slightly reduced, it will be possible to defeat a horde of elven archers in the first week, but without any losses - it's impossible.
Unfortunately, I don't know the release date for version 3.1. But I'm also curious to know what the developers will fix.