SUMMARY
I have configured digikam to import photos to my Windows PC and organize them in folders based on the following structure (yyyy\MM\file). Whenever I try to import them, I get 2 subalbums, one created under the expected hierarchy (MM sub-album nested under YYYY) and a duplicated one, which shows directly as yyyy\MM (month isn't nested in the year, but rather a new folder whose name is yyyy\MM).

If I try to trash the duplicate, it sends to trash both versions. If I restore the images from within trash, it restores them to the expected results.

STEPS TO REPRODUCE
1. Select Import and chose the source device/medium
2. On the Auto-creation of Albums select Date-based sub-albums
3. Date format should be set to custom and use yyyy\MM
4. Import files.
5. In the Albums view, you get both entries.
6. Delete the non-nested sub-album with yyyy\MM format (both entries disappear).
7. Go to Trash, restore the items (nested folder structure is honored)

OBSERVED RESULT
Duplicated sub-albums are shown, one nested and a stand-alone one.

EXPECTED RESULT
Sub-album should be nested and items should be placed there without duplicate entries.

SOFTWARE/OS VERSIONS
Windows: 10

ADDITIONAL INFORMATION