Force Bolt and Blessing of Lamashtu

While playing Legendary Attack on Sandpoint 1-1, Merisiel was at Guard Gate and Evoker Ezren at Old Light. Two times in different replays of the scenario (daily challenge hunting), Ezren wanted to play Force Bolt (had the +2 Force trait power) to defeat some common Monsters on his turn. The first time, Merisiel played Blessing of Lamashtu (Bury) first and Ezren then added Force Bolt. As it was inconcievable that he would fail, I immediatelly rolled the dice and just then realized that there were 6 d12 dice and nothing more!

The second time, it was deliberate. First, 1d6 combat, play B. of Lamashtu - 3d6, then play Force Bolt and it changes to 6d12+14 (maximum achievable bonus is +8 or so, I do not know where the rest came from). Two dice were Ezren-coloured, whereas four dice were Merisiel-coloured.

Could this be related to the fact that earlier, you had to play Blessing of Pharasma after playing the spell to get two dice instead of one and now, it adds the dice retroactively? Nevertheless, it is a strange bug.