So this is not consistent? I tried this a few times in the latest development version and didn't have a problem, so if it does always happen in the described circumstances, it appears to be fixed.
If you have a save where this has happened, or it can be reproduced, please email it (or a Dropbox or Google drive link, etc) to supportdos2@larian.com, with a description (or link to this topic).
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 (zipped) Folder'.