How to reproduce:
1. Open the attached project's Scene labeled "SampleScene"
2. In the Project Window, select the "Foo" Asset
3. In the Inspector, copy an array value (by right-clicking an element and selecting "Copy")
4. Paste the array value (by right-clicking an element and selecting "Paste")
5. Inspect the array value

Expected result: Pasted array value is shown in the Inspector
Actual result: Pasted array value is not shown in the Inspector as the value stays the same

Reproducible with: 2021.2.0a10, 2021.2.0a18
Couldn't test with: 2018.4.35f1, 2019.4.27f1 (Can't copy and paste array values in the Inspector), 2020.3.10f1, 2021.1.9f1, 2021.2.0a9 (Context menu doesn't open)

Note:
- Re-selecting the Asset updates the array value in the Inspector