Environment

• System: openSUSE 15.1
• Desktop: KDE Plasma

Details

Other files under the same folder:

Copyed to other folder:

After rebooted:

File type:

My Guess

There is a place, which caches the file size of every file. When the file is generating(not finished), it caches the file size. After moved to other folder, or computer is rebooted, it will refresh the cache.

But… it’s a bug though :)