Reproduction steps:
1. Open attached project.
2. Open and play "Assets > CodeStage > AdvancedFPSCounter > Examples > ExampleScene" scene.
3. Expand "World Space Example > Advanced Fps Counter > CountersCanvas" game object in the hierarchy.

Actual result: "UpperLeft" and "LowerLeft" game objects are not rendered when they are in the nested canvas(PIC and GIF attached).
Expected result: both objects are rendered.

Additional notes:
* Happens both in game and scene view.
* Related case: 744044 (possibly a duplicate, but happens only in the scene view).

Reproduced with: 5.3.0f1, 5.3.0f4
Not reproducible with: 5.3.0b6