Critical Bug--Temporal clone vs. summon

[R_D]

Twice in a row now, while fighting Gorbat the Supreme Wyrmic, he's summoned a Rimebark, and I decide to use Temporal Clone on it. That's fine, but the next turn after making the clone the game freezes completely, forcing me to manually close it. Not sure if the bug is a result of Temporal cloning a summon or if it's specific to the Rimebark, but regardless it's causing game crashes, which is very bad news.

Quick Edit: just an fyi, I had 1.3 effective talent level for Temporal Clone.