Problems with "Do not import possible duplicates" for Fuji X-T5 images

Short description:
When importing RAW and/or JPG files from my Fuji X-T5 into LrC, despite selecting the "Do not import possible duplicates" function, no duplicates are recognised and all images that have already been imported are imported into LrC again. A “-2” is appended to the file names.
Duplicates of my RAW files from my Canon R5 II are recognised as such and are not imported. All settings are the same in both cases.
LrC 15.2, macOS Tahoe 26.3, iMac with M3

LrC 15.2, macOS Sequoia 15.7.4, MacStudio with M4 Max

LrC 15.2 Windows 11 lasted Version

Long Description:

The problem I described above, whereby RAW files from the Fuji X-T5 are not recognised as duplicates during import and are therefore not imported, is a little more complicated than it seems.
One type of import works, but the other does not.

It works when I import the images as follows:
1. Connect the camera directly to the iMac -> import > all images that have not yet been imported are offered for import. Images that were imported in a previous session are not displayed for import, as they are correctly recognised as duplicates. This is therefore the correct procedure.

2. The same applies if I plug a card reader into the iMac instead of the camera and insert the SD card removed from the camera. Everything works as described in point 1.

It does not work when I Connect the camera or card reader with the SD card to an iPad running iPadOS 26 and import the images into Lightroom on the iPad. Once the images have been imported into Creative Cloud, they will also appear on the iMac after a certain amount of time. If I now connect the camera or card reader with the SD card to the iMac as described in steps one or two, the import process will start. Images that were synchronised via the iPad in the first step and are now also on the SD card are not recognised as duplicates! As I wrote in my first message, the file is then additionally imported from the SD card and correctly appended with “-2” to the file name.

To further investigate the source of the error, I compared the duplicate files on a binary basis. They are exactly the same! So the files are not changed during import/synchronisation via Creative Cloud, but are somehow incorrectly "sorted" when synchronising the images from the cloud to my Desktop PCs.

To rule out problems with the iPad, I have further tested:

This time using LR 9.2 on a Windows 11 PC to upload to Creative Cloud and a Mac Studio MacOS 15.7.4 for direct Import.

It works when I import the images as follows:
1. Connect the camera directly to the Mac Studio -> import > all images that have not yet been imported are offered for import. Images that were imported in a previous session are not displayed for import, as they are correctly recognised as duplicates. This is therefore the correct procedure. Even if I rename the RAW during Import.

2. The same applies if I plug a card reader into the Mac Studio instead of the camera and insert the SD card removed from the camera. Everything works as described in point 1.

It does not work when I connect the camera or card reader with the SD card to copy the RAW Files to the Windows 11 PC using LR 9.2 to upload the RAW to the Creative Cloud. Once the images have been imported into Creative Cloud, they will also appear on the iMac after a certain amount of time. If I now connect the camera or card reader with the SD card to Mac Studio, the import process will start. Images that were synchronised via the windows PC and also present on the SD card are not recognised as duplicates!

The files are also binary identical when using this method via am iPad.

The problem only affects my X-T5 files, not my Canon R5 II files!

The problem seems to lie with importing/synchronising via Creative Cloud.

Best regards,

Ulrich