1) Open the attached project
2) Open the "bug" scene, and open the timeline window and the animation window
3) Select the "Timeline" object to show it in the Timeline window. Lock the timeline window.
4) Go in play mode
5) let the timeline play, and wait for it to end. The "Cube" object should be Active.
6) Select the Cube in the hierarchy. In the Animation window, add a key to the Cube's clip.

Result: The Cube is Inactive.
Expected: Changing an Animation clip should not evaluate the Timeline (the Cube became inactive because the timeline was evaluated).