How to reproduce:
1. Open the attached project
2. Select the "Script" object in the hierarchy
3. Select one of the "testtest" array elements
4. Cycle through them using the up arrow key (expected result: the selection goes all the way to the first element and loops back to the last)
5. Observe that the selection is not of the last element but second last
6. Now cycle again using the down arrow key (expected result: the selection goes all the way to the last element and loops back to the first)
7. Observe that the selection is lost completely

Expected result: the selections loop to first/last array element when cycling through them via the arrow keys
Actual result: the selections are inconsistent, sometimes even lost when reaching the last array element

Reproduced in: 2021.2.0a2, 2021.1.0a10
Not reproducible in: 2021.1.0a9, 2020.2.0f1, 2020.1.17f1, 2019.4.17f1 (Some older versions don't have the looping functionality at all and just stop the selection when reaching the last/first element)