Because of this behavior a keyframe might appear in a wrong location.
It's expected that, when a change is made to the object in a record mode, a keyframe will be created at the marked location in the Timeline.
But since the white "marker" jumped back to the clips last frame, marker is no longer displayed at it's actual location.
So when a new frame is created, it's created not where the "marker" is displayed, but where the marker should be displayed.

To reproduce:
1. Open attached project "Tester Testing.zip".
2. Open "Test" scene.
3. Select "Cube" in Hierarchy.
4. Select "Recorded" clip in Timeline, and enter Record mode.
5. Try Moving the white "marker" in Timeline window. It will jump back to the last frame of "Recorded" clip.
6. Select "Cube" in Hierarchy, and change any value in inspector to create a Keyframe.

Expected result: Keyframe is created at Marker's position.
Actual result: Keyframe is created at the different location. (where marker should have been, if it would not jump back to "Recorded" clips last frame)

Reproducible: 2017.2.0b9, 2017.3.0a6
Not reproducible: 2017.1.0p5, 2017.2.0b8, 2017.3.0a4