1. Open the attached project "1210312.zip"
2. Open the Sample Scene
3. Open the Timeline window and select Cube GameObject
4. Select frame 61 in the Timeline
5. Double-click the Recorded (1) Animation to open it in the Animation window
6. Start recording through the Animation window and make some changes

Expected result: Changes are made for the Recorded (1) Animation
Actual result: Changes are made for the Recorded Animation

Reproducible with: 2017.4.36f1, 2018.4.16f1, 2019.3.0f6 (1.3.0-preview.6), 2020.1.0a21 (1.3.0-preview.6)

Notes:
In Unity 2017.4, the Recorded (1) Animation would always be selected instead of the Recorded Animation.
In Unity versions below 2019.3.0a1, Timeline was not yet a package.