Game Version: 2.8
Patch 2.8 note said - “Blessed Construction: Fixed an issue where the power would only work on a single building when multiple were selected.”
Actually it works for only a single building despite of multiple buildings has been selected, but you have to pay the cost multiple times and lose the chance to activate it again. Only one building has Blessed Construction visual effect and there are no improvement in the construction speed for the others. So, it’s even worse than before. You pay tons of resources for nothing.