When we have animation for child component with stepped frames (see Frames.png), these frames doesn't act as stepped frames and sometimes interpolates between frames (See white quad in Bug.gif).

Reproduction steps:
1. Open project AnimationFrames.zip
2. Open "Test" scene
3. Hit play

Expected result:
White quad "teleports" from one position to another continiously (see Expected.gif)

Actual result:
White quad moves in between frames (see Bug.gif)

Notes:
Each frame has "Broken" checked and "Both Tangents>Constant" selected.
When animation is run from Animation panel instead of Play mode, it plays correctly.
If first frame of animation is copied and pasted to the last frame, it plays correctly in the Play mode as well.

Reproduced on: 5.2.5f1, 5.3.3f1, 5.4.2f2, 5.4.3p1, 5.5.0f1, 5.6.0a3