Php 成员变量不接受带有元素的数组

在将WordPress更新到6.0.2之后，我看到了"死亡的白屏"--我只是说

有一个严重的错误

没有进一步的解释.

After some debugging I located the line, that produces the error:
/wp-content/plugins/jet-theme-core/includes/locations.php line 53

它是将数组赋给$this->_locations[ $id ]的类Jet_Theme_Core_Locations的函数

有了这些声明

private $_locations     = array();
public $test = array();
private $_test = array();

我测试了一些陈述，发现

$this->_locations = true;    // works
$this->_locations = "test";  // works
$this->_locations = array(); // works
$this->_locations = array("test");           // produces a critical error
$this->_locations = array("test" => "test"); // produces a critical error
$this->_locations[] = "test";                // produces a critical error
$this->_locations["test"] = "test";          // produces a critical error
$test = array("test" => "test"); // works
$this->test = array();           // works
$this->test = array("test");     // works
$this->_test = array();          // works
$this->_test = array("test");    // works

我一定是漏掉了什么.可能是很明显的事情.但我想不通，这是什么.

[编辑:] PHP日志(log)文件显示:

PHP Fatal error:  Uncaught Error: Class 'Elementor\\Post_CSS_File' not found in /wp-content/plugins/jet-theme-core/includes/locations.php:106