Because this new version is updated according to new policy, so can't access the old data stored under the path "storage/emulated/0/MainData/notes.db".
To be able to restore old data, please uninstall the current version and install the old version with the apk link
https://drive.google.com/file/d/1P3muGMBdyQcOpSl6Du7TZQfKKeXhU3uf/view?usp=sharing