OK, I’ve just released version 6.3.7.7 which fixes the issue.
In fixing another issue for speakers of non Latin languages, I accidentally introduced this bug with the custom code editor. It happens when editing selectors created before June 2021, if the selector label contains non-alphanumeric characters like dots, brackets, or Hebrew and Chinese etc.
If possible, I recommend using the History feature to jump back to the point before styles were lost as a result of using the code editor. You can then use the editor freely, so long as you’ve upgraded to version 6.3.7.7. You can upgrade BEFORE using the history feature BTW.
I’m really sorry for trouble this has caused. I feel particularly bad about bugs that cause data loss. I really hope you can restore things on the sites you were testing this on. Please let me know if there’s anything more I can do to help.
Cheers,
Sebastian