Timeline Control track, new recorded animation clip does not evaluate

When creating a new animation track/clip within a nested Control track, the newly created animation does not evaluate/playback.
Scrubing the timeline outside the timespan of the nested control track clip, forces an update/graph rebuild, making the animation evauate properly.

repro:
- open attached project
- open TEST scene
- open Timeline and select TL GO
- double-click control track clip to enter it
- drag Cube from hierarchy to Timeline and create a new Animation track
- enable rec mode
- create a few keys...
bug: animation does not play when scrubbing the time.
expected: animation should be seen/evaluated.
workaround: scrub time past the control track clip range, then come back in time... animation is properly evaluated.

see attached TL_ControlTrack_AnimBug.mov

this is a regression...
repro in...
Version 2018.3.0f2 (49866f0a5d12)
Branch: 2018.3/release

NOT repro in...
Version 2018.2.16f1 (39a4ac3d51f6)
Branch: 2018.2/staging