How to reproduce:
1. Open the user-submitted project ("Test.zip")
2. Click on the "Character" object and in Its Inspector Window observe that there are overrides to the prefab
3. While the "Character" object is selected open the Animation Window and click "Preview"
4. Check the objects overrides again

Expected result: there are no transform changes to any of the model's bones and no overrides are detected
Actual result: the transform for the "RigNeck" bone is changed from "5.836886e-08" to "5.960464e-08" and overrides are suggested for the main prefab

Reproduced in: 2019.2.0a9, 2019.1.0b8, 2018.3.10f1

Note: only reproduces with very small numbers, likely a rounding issue.