A couple of people ran into a similar problem before today's update, related to a timing issue when saving during a dialogue (just as it ended, but before the dialogue sent an event that it was over). In that case, the characters also took no damage, and were not affected by surfaces. I'm not sure if the fix was included in the update.
Do you still have your saves from that playthrough? If you email your earliest affected save (or a Dropbox or Google drive link, etc) to supportdos2@larian.com, I'll get someone to check it out.
Each save is a folder in the '..\Documents\Larian Studios\Divinity Original Sin 2\PlayerProfiles\<ProfileName>\Savegames' folder. In Windows Explorer you can zip file(s) and folder(s) by right clicking on it/them and selecting 'Send To | Compressed (zipper) Folder'.
