1) Open animation window & Timeline window
2) Create a new gameobject then click on "Create" in timeline window
3) Add Animation Track
4) Bind Main Camera object to the track
5) Select MainCamera
6) Click on record on the Animation track, create some keyframes by moving the camera object
7) Stop recording
8) Double-click on the track, the clip is now opened in the animation window
9) Go in playmode

Result: Timeline only plays the first frame and stays stuck until the user closes the Animation Window.
Expected: Timeline should continue playing

Repro with: 2020.2.0a7 (any timeline version)
Not repro with: 2020.2.0a8 (any timeline version)