Steps to reproduce:
1. Open the attached project (UICanvasBugReport.zip)
2. Open the Assets/NotOk.unity scene
3. The NotOk scene has a GameObject(UI) in the root of the scene with position (1.0f; 1.0f; 1.0f)
4. Play the scene
5. Open Profiler
6. Profiler shows clearly redundant calls to CanvasRenderer.OnTransformChanged, CanvasRenderer.SyncTransform, CanvasRenderer.SyncWorldRect

Expected result: UI Canvas should update the Transform only once
Actual result: UI Canvas redundantly updates Transform

Note:
Everything works fine with default position (0f, 0f, 0f)

Reproduced with: 5.5.0a1, 5.5.0f3, 5.5.0p2, 5.6.0b2
Not reproduced with: 5.3.6p8, 5.4.3p3
Regression introduced in 5.5.0a1