<?php
    declare(strict_types=1);
    class MyObject
    {
        public function __construct(public $pub, protected $prot, private $priv)
        {
        }
    }
    /** @var MyObject[] $arr */
    $arr = [
        new MyObject(1, 'first', true),
        new MyObject(2, 'second', false),
        new MyObject(3, '3rd', false),
    ];
    echo $arr[0]->pub; // breakpoint here

Try to debug the above code in PhpStorm 2021.3.

Once stopped at the breakpoint, see the content of $arr variable in the variables -- it expands the whole array just fine. Now use Evaluate window to see the same variable -- it will report "Cannot get property" for array elements (when they get expanded).

The same works with PHP 8.0 in the same environment (the same Xdebug version etc).