Bloom of Twilight/Summer (Bug?)

So in FE, we could rely on getting some good sites using this, expecting essences from shards, mines and whatnot. But now it seems to not work at all, the only places I can get it to work is near rivers etc. making it essentially useless, since snaking and outposts do the same trick. What did you change with this, and how can I change it back if it's not a bug? ^^

200 mana is an hefty amount, so I expect results when using it, and now it's no reward at all. 

(just a personal experience as well, it seems outposts and ZoC from cities makes viable cities when they shouldn't, and the Bloom spell does not work as advertised, I suggest swapping the mechanics if there is some strange stuff going on here, active should always be better than passive and whatnot)