https://bugs.kde.org/show_bug.cgi?id=454676

            Bug ID: 454676
           Summary: Metadata missing from thumbnails after moving more
                    than 30 to 40 images at a time between albums.
                    Metadata still in the file.
           Product: digikam
           Version: 7.6.0
          Platform: Other
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Albums-Engine
          Assignee: digikam-bugs-n...@kde.org
          Reporter: resti...@gmail.com
  Target Milestone: ---

Metadata missing after moving more than 30 to 40 images at a time between
albums:
Click on album name and highlight some thumbnail images.
Drag the images and drop into a different album and select move.
Images move correctly but metadata disappears from the thumbnail and the
thumbnail pop up (tooltips I think it's called). And the date box on the
captions page is blank (the time is still there).
The metadata still exists according the the metadata tab on the right toolbar
(and exists in the image files according to a third party metadata app).
I can recover the metadata by using ITEM: Reread metadata from selected files.
This works everytime.
Only some images lose the metadata after a move. Not always the same number or
same images.
***
STEPS TO REPRODUCE
1. Created 2 folders and copied 225 images into one. 
2.  Moved various numbers of images to the second folder and checked results.
Repeated with various numbers of images. Returned images to starting set up
each test.
3.  Moved all 225 images: 36 missing metadata.
4. Moved 30 images: all OK.
5. Moved 45 images: 1 missing metadata
6. Moved 60 images: 12 missing metadata
7. Moved 50 images: 4 missing meta data.
8. Moved all 225 images again: 97 missing metadata.

There is no pattern I can find. Never all the same images missing their
metadata. All images are jpg.
The thumbnail on images with missing metadata still shows the file name and the
file size and 0x0 (0.0Mpx) on each.

SOFTWARE/OS VERSIONS
Windows: 10 Home Ver. 10.0.19043 build 19043
KDE Plasma Version: ??
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2 (built against 5.15.2)

ADDITIONAL INFORMATION
Running on an HP Pavilion Gaming PC, Desktop 690-10xx x64. Bios AMI F.43
2020-06-16
Digikam using MySQL Client (MariaDB 10.6 (x64))
Approximately 100,000 images in the database.

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