How to reproduce:
1. Open the attached project
2. Open the "SampleScene" and select "Input array" in the Hierarchy
3. Try to add bindings to the very first element of the array via the plus sign button
4. Observe that the array doesn't expand correctly

Alternatively:
3. Select the "Custom" object and change the first element's field to "A" in the dropdown menu
4. Observe that the expansion is broken for the first array element only (might be broken for other too if checked on an older, non-fixed version)

Expected result: Arrays with custom property drawers always expand correctly
Actual result: The first first element of an array doesn't expand correctly if it uses custom property drawers

Reproduced in: 2022.2.0a8, 2022.1.0b12, 2021.2.16f1, 2021.1.28f1, 2020.3.31f1
Not reproducible with: 2020.2.0a13