Reproduction steps:
1. Open project “My project (44).zip”
2. Open “SampleScene”
3. Enter Play Mode
4. Observe the “Square” GameObject through the Game view

Expected result: When the animation ends the GameObject returns back to its previous position (0,0,0)
Actual result: When the animation ends the GameObject does not return back to its previous position (0,0,0)

Reproducible with: 1.6.5 (2021.3.29f1), 1.8.2 (2022.3.77f1, 2023.1.9f1), 1.8.4 (2023.2.0b5)

Reproducible on: macOS Ventura 13.2.1 (Intel), Windows 11 (by the reporter)
Not reproducible on: No other environment tested

Notes:
- Also reproducible in Standalone Player
- Post Extrapolate for the “Square” GameObjects animation clip is set to None (Window\Sequencing\Timeline\NewAnimation)
- According to the documentation - when Post Extrapolate is set to none, in the gap after the selected Animation clip, the GameObject uses its transform, pose, or state from the scene (0,0,0): https://docs.unity3d.com/2018.2/Documentation/Manual/TimelineGapExtrapolation.html
- The Timeline clip is not fully processed to the end due to the calculation for “Timeline\Options\Duration Mode\Based on clips” being wrong

Workaround: manually setting the length of the Timeline by setting “Timeline\Options\Duration Mode\Fixed Length” and dragging the end of the Timeline further than the end of the last track