Animation re-targeting not working if the primary character is not being rendered by the camera.

Description:
Animation of the first character is not reflecting on the second character after attaching the retargeter script to it when the first character is out of the camera view.

Steps to Repo:
1. Add a character to the scene > Add locomotion animator controller to the character
2. Add the second character to the scene.
3. Remove Animator component of the second character.
4. Add "Retargeter" script to the second character.
5. Assign GO & Avatar to script.
6. Create small offset between both characters.

- Validate pose retargeting at runtime.

Actual Result:
The animation of the parent character is not reflecting on the second character when the first character is out of the camera view

Expected/Desired Result:
The second character mimics the first character's motion.

Frequency:
Always

Environment:
Windows 10/Mac 10.12.6
License Type: Free/Pro
Unity 2017.3.0b6

Reproducible with:
Unity 2017.3.0b7, Unity 2017.2.0f3

License type: Pro