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Why RAW-Preallocated disk is converted to RAW-sparse after doing cloning/exporting/importing/disk migration of VM

Solution Verified - Updated 2017-12-19T16:59:15+00:00 -

Issue

The disk was automatically converted to RAW sparse (Virtual Size =/= Actual Size ) from RAW preallocated (Actual size == Virtual size) after cloning a VM.
Why the actual size of the disk got reduced after migrating the disk of a VM from one storage domain to another?
Actual size of the disk is reduced after importing the VM from the export domain.

Environment

Red Hat Virtualization 4.0.
Red Hat Virtualization 4.1.
File-based storage domain.

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