In the attached project, if you delete all the tracks from the timeline and then undo the deletions with ctrl-z, an assertion failure will occur:

Assertion failed: In order to call GetTransformInfoExpectUpToDate, RendererUpdateManager.UpdateAll must be called first.

1. Open attached project and load timeline.scene
2. Select TimelineContainer from the scene hierarchy
3. delete all the tracks from the timeline
4. Undo the track deletions with crtl-z
5. Assertion occurs when attempting to undo deletion of the second track