The problem is with 2DPlatformer package from AssetStore (https://www.assetstore.unity3d.com/en/#!/content/11228)

Regression from 5.5.3f1 - works in wrong way in 5.6.0f3 and in 2017.1.0a6

Bomb's animation is broken

How we can reproduce it using the example you attached
1 Open attached project (or download from AssetStore) in 2017.1.0a6
2 Press Play and wait while bomb appears (about 30 seconds)

for Actual and Expected results see gifs in comments