Version Used:
Visual Studio Community 2019 16.9.3

Steps to Reproduce:

1. Have a (non-class) array variable be assigned the null literal value. For example:

int[] ar = null;

2. Hover over the null literal.

Expected Behavior:
The tooltip always shows the icon for the array type, which is a class.

Actual Behavior:
The tooltip icon reflects the array's element types. For the cases of struct arrays, it displays the struct icon, and so on.

Screenshots: