Whenever an asset package is imported from the Asset Store with Unity 5.5, an error message appears.

Steps to reproduce:
1) Create a new project in Unity 5.5 beta.
2) Import any project from the Asset Store.

As soon as the importing starts, this error message is displayed in the Console:
Package corrupted, deduced GUID exists but at different destination path, refusing import.
UnityEditor.Web.JSProxyMgr:DoTasks()

This error doesn't seem to cause any issues to the project itself.

Reproduced on:
5.5.0b6

Did not reproduce:
5.4.1p3, 5.3.6p6

Asset Store projects tested:
Pop Pop Pop, Endless Bubble Shooter Woodland Bubble, Codey's Lab - Space Shooter - Entire Course, Tanks Multiplayer.