How to reproduce:
1. Open the "repro" project
2. Open the "scene" scene
3. Press Play and observe the animations

Expected result: The animations should not freeze into poses ("correct.gif" attached).
Actual result: The animations freezes into poses ("wrong.gif" attached).

Reproducible with: 2017.1.0b2, 2017.1.0a1, 5.6.3p3, 5.6.0b11.
Regression introduced in: 5.6.0b11.
Not reproducible with: 5.5.4p4, 5.6.0b10, 2017.1.0b3, 2017.1.1p2, 2017.2.0b11, 2017.3.0b1.

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Fixed in: 2017.1.0b3