Explorer displays wrong "Size on disk" for junction file.
This issue happens since shell32.dll doesn’t obtain the correct size of allocation unit for the volume associated with directory file on the other volume when calculating Size on disk.
This symptom only affects the looks of the property. It doesn't affect any functionality of the file system.Windows has a feature to link the directories to represent the storage data in the another volume on the same computer. This issue happens when linked volume has a different size of allocation unit.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.