Reproduction steps:
1. Open the attached project "TimelineBugs.zip";
2. Open the scene TimleineInlineClipAssetBundle_Bug;
3. Open TimelineA prefab in the Timeline window and notice that it has the Animation track attached;
4. Enter a play mode and notice how the bundled version of that same TimelineA prefab gets instantiated as TimelineA(Clone);
5. Observe TimelineA(Clone) in the Timeline window;

Expected result: the cloned prefab will still have an animation with all keys.
Actual result: the animation is still playing on cloned prefab, but there are no keys.

Reproduced on: 2017.1.2p4, 2017.2.1p2, 2017.3.0p4, 2018.1.0b5, 2018.2.0a1.