Synchronizing a parent folder A of a synchronized folder B results in the loss of the children of B on the client side

Steps to reproduce:

• Register folder B as a synchronization root, check that B and its children are synchronized locally.
• Register a parent folder A of folder B as a synchronization root, this must automatically unregister B.

=> Client side, folder A is there with its children including B, but children of B are not present.

This is probably related to the mechanism that unregisters all the registered children of a newly synchronized root.