How to reproduce:
1. Open attached project "GetComponentInParentBug_2.zip" and scene "SampleScene"
2. In Hierarchy window, select and expand "Cube1"
3. In Inspector window, make sure that "The Script" component -> "Root Object" is set to "Cube3"
4. In Hierarchy window, make sure that "Cube3" object is deactivated
5. In "TheScript" uncomment line 13
5. Enter Play mode
6. Observe Console window

Expected result: no errors are thrown, "Cube3" is printed
Actual result: errors "No overload for method" is thrown

Reproducible with: 2017.4.32f1, 2018.4.8f1, 2019.2.4f1, 2019.3.0b2, 2020.1.0a3