Shortcut keys for copy from one track and paste to another track doesn't work on Mac OSX

Steps to Reproduce:
1. Create a new project.
2. Download the Adam Character package from assets store
Link : https://www.assetstore.unity3d.com/en/#!/content/74842
3. Create a new scene
4. Add the Adam Character prefab to the scene.
5. Open Timeline Window from Window Menu
6. Create a new Timeline.
7. Drag and Drop the Adam character to the Timeline window.
8. Click on the button located beside the "Red button"
9. Click on Add from Animation clip.
10. Select any animation
11. Duplicate the Track using CMD + D
12. Copy(CMD + C) the animation clip from the first one that was create
13. Select the Duplicate track and Paste (CMD + V)

Expected Result:
The copied animation clip should be placed on the track that was selected.

Actual Result:
The copied animation clip gets pasted under the track from which was copied.

Frequency:
Always

Bug Reproducable on :
2017.3.0b11, 2017.2.0f3, 2017.1.0f3, 2017.1.0b5, 2018.1.0a5

Additional Note:
Copy & Paste with Right click of mouse works exactly as Expected Result.

Environment Details:
Unity 2017.3.0b11
OS: Mac OSX

Video Link for the Bug : https://globalstep-my.sharepoint.com/personal/sanket_pilankar_globalstep_com/_layouts/15/guestaccess.aspx?docid=18b827e294e6c471b811c3c1e11015ab4&authkey=AQqQXuwu3VDVbZHCongMqC8&e=3562b7535e1e48e6865aa579e046eeb5