fix name resolving

Author: staabm

src/Analyser/MutatingScope.php

@@ -4382,7 +4382,10 @@ private function shouldInvalidateExpression(string $exprStringToInvalidate, Expr
 			if (
 				$exprStringToInvalidate === '$this'
 				&& $node instanceof Name
-				&& in_array($node->toLowerString(), ['self', 'static', 'parent'], true)
+				&& (
+					in_array($node->toLowerString(), ['self', 'static', 'parent'], true)
+					|| $this->getClassReflection()->is($this->resolveName($node))
+				)
 			) {
 				return true;
 			}

tests/PHPStan/Rules/Methods/NullsafeMethodCallRuleTest.php

@@ -65,4 +65,9 @@ public function testBug8523b(): void
 		$this->analyse([__DIR__ . '/data/bug-8523b.php'], []);
 	}
 
+	public function testBug8523c(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-8523c.php'], []);
+	}
+
 }

tests/PHPStan/Rules/Methods/data/bug-8523c.php

@@ -0,0 +1,26 @@
+<?php declare(strict_types = 1);
+
+namespace Bug8523c;
+
+use function PHPStan\Testing\assertType;
+
+class HelloWorld
+{
+	public static ?HelloWorld $instance = null;
+
+	public function save(): void {
+        HelloWorld::$instance = new HelloWorld();
+
+		$callback = static function(): void {
+            HelloWorld::$instance = null;
+		};
+
+		$callback();
+
+		var_dump(HelloWorld::$instance);
+
+        HelloWorld::$instance?->save();
+	}
+}
+
+(new HelloWorld())->save();