add test for bug 9465

tests/PHPStan/Rules/Methods/CallStaticMethodsRuleTest.php

@@ -824,4 +824,11 @@ public function testBugInstanceofStaticVsThis(): void
 		$this->analyse([__DIR__ . '/data/bug-instanceof-static-vs-this.php'], []);
 	}
 
+	public function testBug9465(): void
+	{
+		$this->checkThisOnly = false;
+		$this->checkExplicitMixed = true;
+		$this->analyse([__DIR__ . '/data/bug-9465.php'], []);
+	}
+
 }

tests/PHPStan/Rules/Methods/data/bug-9465.php

@@ -0,0 +1,49 @@
+<?php declare(strict_types=1);
+
+namespace Bug9465;
+
+interface ISingleton
+{
+	public static function singleton(): ?static;
+}
+
+class Component
+{
+	public function getStuff(): mixed
+	{
+		return [1, 2, 3];
+	}
+
+	/**
+	 * @param mixed[] $args
+	 */
+	public static function __callStatic(string $method, array $args): mixed
+	{
+		if (is_a(static::class, ISingleton::class, true) && ($singleton = static::singleton())) {
+			//Call to an undefined static method static(Component)::singleton().
+
+			$singleton->getStuff();
+		}
+		return null;
+	}
+}
+
+/**
+ * @method static void unavailableStatic()
+ */
+class Application extends Component implements ISingleton
+{
+	protected static Application $_app;
+
+	public function __construct()
+	{
+		static::$_app = $this;
+	}
+
+	public static function singleton(): ?static
+	{
+		return static::$_app; //<- Method Application::singleton() should return static(Application)|null but returns Application.
+	}
+}
+
+Application::unavailableStatic();