Cannot redeclare __construct bug

Hello,

I tested this little code on standard PHP7.4 without any error e.g. on http://www.writephponline.com

function test_class() {
	return new class {
		public $value;
		
		function __construct() {
			$this->value = 'my value';
		}
		
		public function some_class() {
			return new class {
				public $internal;
				
				function __construct() {
					$this->internal = "internal";
				}
			};
		}
		
	};
}

echo test_class()->some_class()->internal;

When going on with code snippets, I have a __construct redeclare bug… tested on WordPress 5.5.1 fresh site.

So I believe there is something wrong with the plugin somewhere.

Any help is appreciated.