Groupfolder deleted regular folder


I wanted to change my existing folder “photos” into a group folder. I therefore created a new group folder with exactly the same name. Now it seems as if the original folder with more than 50000 pictures has been deleted/overwritten. I am sure this can be made undone? What am I supposed to do in that case?

If you go to the Group Folders settings and remove the partucular group access to the folder, the original folder will be restored. You can then delete the group folder.

This seems to be a bug in the app.