Reproduction steps:
1. Open the attached project "Transition preview bugs.zip";
2. Select Cube Animator Controller.controller in this scene.
3. Open the Animator window.
4. Select the transition between CubeClip and CubeClip 0.
5. Drag Cube from the project window into the transition preview.

Actual results: The cube isn't visible in the inspector - it is out of view.
Expected results: The model will be displayed using the Transform position.

Reproduced on: 5.5.3p3, 5.6.2p4, 2017.1.0f3, 2017.2.0b5, 2017.3.0a2.