I just received an email back from Larian support and they claim they have found the cause of the crash and are working on eliminating it for a future update. No time frame given but at least they think they've found the issue.
Same! I filed a bug, sent them save games and dumps and told them how to reproduce and they contacted me today saying they identified it and "the team has found a cause for the game crashing when saving and this should be fixed in a future hotfix".
