Thanks for the bug report! Checked out your save and it seems I couldn't reproduce the bug. Just to be sure, Kai Viljoen (Slot 5) is the one supposed to throw the grenade right? I also noticed that the window was already shattered, was the save you provided after the grenade was thrown? If possible I'd like to have the save before the grenade was thrown.
Btw for the logs, do you have a an output.log file on the same folder as resolve_layers.log? That'd be the logs we'd want to look into whenever you run into errors, thanks! Do note however that the game logs errors while the game is running so only the most recent save is on the output.log file, the best way is to make a copy or upload the output.log file after you've come across the bug so that we can be sure that the error messages were captured in the log file. A bit of a long read but thanks for reading through!