Cannot remove folder from Sub-collections

Hello again,

I cannot remove folders from a collection:

  1. Add a folder containing subfolders and files as a new sub-collection.
  2. Try to remove a subfolder from the collection: nothing happens.
  3. Try to remove the parent/main folder from the collection: nothing happens.
  4. Try to remove a file from the collection: it works.

Also, the "Remove from collection" option is not available in the context-menu. Only in the Delete menu (where it doesn't work, as described).

When adding as Members, everything works as expected and the context menu entry is also available.

Sub-Collections have to be deleted, not just removed, since they don't exist anywhere else.

Actual files and folders, which the collection just points to, can be removed from a collection without deleting them.