Selection To Background Linked/

When I use “Selection to Background”, it seems to be linked as if it was a component in the background. I.e. if I edit the foreground the background reflects it?

Sometimes when I goto the background and delete it, the foreground points disappear, yet an outline remains?

Similarly, if I edit the background, the point changes in the foreground yet the outline remains?

When I use this command nothing happens since I updated Glyphs with the latest version 1.3.26 (530). Background remains empty.
Before today’s update everything worked well with “Selection to Background”.
Help, please!

There is a bug in 1.3.26. Only work with copies if your files if you do background editing. Next update is due early next week.