Reproduction steps:
1. Open the attached project "TimelineTest.zip";
2. Open the TestScene;
3. In the Visual Studio solution, place a breakpoint at line 21 of TestPlayable.cs;
4. Attach the Visual Studio solution to the Unity executable;
5. Open the Timeline window and select the MainCamera to view the Main Camera Timeline;
6. Play the timeline while in Edit mode;
7. When the breakpoint is hit, inspect the value of info.evaluationType in Visual Studio.

Expected results: info.evaluationType should be Playback as the timeline is in the Playback state.
Actual results:info.evaluationType is Evaluate.

Reproduced on: 2017.1.0f1, 2017.1.1p3, 2017.2.0f2, 2017.3.0b2.

Note: the same steps can be followed while Unity is in Play mode and the info.evaluationType flag will be set to Playback, as expected.